I've made a complete Generac error code guide now in PDF format with some other useful information in there for anyone who wants to keep a copy on hand as well! You can download the PDF version of this guide here: images/Generac-Error-Code-Fault-Guide-eCodes.pdf
This is a list of the Generac Evolution e-Codes (alarm codes) that you may see on the display. Under each is a brief description of what the problem is and the possible causes.
PLEASE NOTE THAT THIS 2018/2019 UPDATED LIST WAS CUSTOM WRITTEN BY ME (CHRIS FLAGG), FOR THIS SITE AND IF SEEN ELSEWHERE WAS COPIED FROM THIS ORIGINAL POST..THIS LIST IS NOT TO BE COPIED WITHOUT WRITTEN PERMISSION
Controller Fault
ALARM
The controller has an internal problem and should be replaced. No error code number is given for this fault.
Overcrank 1100
ALARM
This is a more common error code. Basically this means that the controller is telling the engine to start, but it cannot start for some reason. The controller has verified that the engine is actually cranking, but not starting. This is most likely fuel or maintenance related.. Check to make sure that the fuel supply is on and if on LP gas, the tank is not empty.
Overcrank 1101 (This ONLY pertains to 8 & 9kW units)
ALARM
The controller has limited the number of starts at 10 to prevent damage to the starter. Fuel and maintenance related items should be checked. Valves are normally a culprit of overcrank alarms..
Overspeed 1200
ALARM
This overspeed e-code is for prolonged overspeed (Hz is over set threshold). This means that for 3 seconds, the frequency (engine speed) was 72Hz or above on a 60Hz unit or 60Hz or above on a 50Hz unit (not a US unit). Most likely cause is a stepper motor or mixer assembly issue. Could have come unplugged, become jammed or anything else that may increase engine speed.
Overspeed 1205
ALARM
This overspeed e-code is for instantaneous overspeed (Hz is over set threshold). This means that the frequency (engine speed) was very high. 75Hz or above on a 60Hz generator, or 62Hz or above on a 50Hz model (again, not a US generator). The same causes as the above overspeed code. Stepper/mixer problems.
Overspeed 1207
ALARM
This is an uncommon overspeed alarm and is a backup to the normal overspeed monitors. This monitors the zero cross timing of the voltage regulator (AVR) to determine the alternator frequency. It's set for 150 Milliseconds of 4500 RPM or higher. It's only used if the normal ignition pulses are not seen by the controller from the 18 wire.
Low Oil Pressure 1300
ALARM
This is the normal shutdown alarm for low oil or low oil pressure and may be caused by a couple of things: 1. The oil level is low and should be checked and filled as needed (most common during extended outages). 2. The low oil pressure (LOP) switch is faulty and the oil pressure should be checked and the switch replaced. 3. Some internal problem with the engine not building oil pressure. This would require an oil pressure test to verify.
High Temperature 1400
ALARM
The high engine temperature switch has closed and shut the unit down for exceeding the engine temp high limit. The unit should be checked for debris blocking the vents that might be restricting airflow. If nothing is found, the high temp switch and its wiring should be checked.
RPM Sensor Loss 1501
ALARM
This RPM alarm is set when a 2 cylinder unit was already running and stalled or lost the RPM signal from the ignition coils. Possible causes could be a fuel issue, the LP tank is empty, 1 or both ignition coils are damaged, or the unit was overloaded quick enough that the engine stalled and set the alarm.
RPM Sensor Loss 1505
ALARM
This RPM alarm is set when a 2 cylinder unit is cranking. It's caused when the controller told the engine to crank, but did not get a signal back that the engine was actually turning. Possible causes are a dead or bad battery, bad starter or wiring to the starter, or ignition coil problems.
RPM Sensor Loss 1511
ALARM
This RPM alarm is set when a single (1) cylinder unit was already running and stalled or lost the RPM signal from the ignition coil. Possible causes could be a fuel issue, the LP tank is empty, ignition coil is damaged, or the unit was overloaded quick enough that the engine stalled and set the alarm.
RPM Sensor Loss 1515
ALARM
This RPM alarm is set when a single (1) cylinder unit is cranking. It's caused when the controller told the engine to crank, but did not get a signal back that the engine was actually turning. Possible causes are a dead or bad battery, bad starter or wiring to the starter, or ignition coil problems.
Underspeed 1600
ALARM
An e-code that's triggered when the engine speed is slowed to 55Hz for a 60Hz unit for 30 seconds (or 40Hz for a 50Hz unit). Most likely problem is that the unit is overloaded or something has tried to turn on that overloaded the unit. Could also be fuel related or a stepper motor throttle control problem .
Underspeed 1603
ALARM
This alarm is triggered when the engine never came up to its rated 3600 RPM speed during startup. Stepper motor and the fuel system should be checked for problems. Make sure the orange fuel selector knob is set to the correct fuel.
Overvoltage 1800
ALARM
The alarm is set when the unit's rated voltage output is exceeded for a prolonged period of time. A voltage test should be done to determine the problem. Most likely a bad AVR (automatic voltage regulator) which is internal to the Evolution control board
Undervoltage 1900
ALARM
e-Code is displayed when the output voltage is below 80% of the unit's rated output for 10 or more seconds. Please note that if the installed firmware is below version 1.12 you should update the firmware before going further. Frost or debris on the slip rings can cause a bad connection to the brushes where version 1.11 and below would shut the unit down before attempting to 'clean' the slip rings during running. Version 1.12 and above will run the unit with excitation voltage for 4 minutes before shutting down for undervoltage.
Undervoltage 1901
ALARM
A sudden drop in voltage will set this alarm. This can also occur during a stall condition which may be fuel related and can throw troubleshooting in the wrong direction. All engine functions should be checked as well as voltage. Causes could also be a stator or rotor problem, brush problem, unit being overloaded, or wiring problems. Firmware v1.12 or higher should also be installed before going further.
Undervoltage 1902
ALARM
Fault is displayed when both zero crosses are missing from the controller's input for 1.5 seconds or more. Could be a faulty excitation winding, zero cross circuit, loose wiring, or field boost hardware problem. Same applies here, v1.12 or later firmware should be installed.
Undervoltage 1906
ALARM
Same basic alarm as above, however only 1 zero cross is missing for 1.5 sec instead of both. See Undervoltage 1902 above for causes and troubleshooting.
Wiring Error 2099
ALARM
The controller's wiring on the customer side is most likely miswired. This is normally caused when the high and low voltage wiring connections (194, 23, N1, N1 and T1) are confused during the installation. Normally this alarm won't appear after the initial install since that wiring doesn't normally change after the installation.
Overload Remove Load 2100
ALARM
Alarm is triggered when the unit is overloaded and the internal CT (current transformers) detected an overload condition. This should be 1 or both CT's that detected the problem. The loadshed modules (if in use) should be checked, load should be removed, or load shedding should be installed to prevent the overload from happening.
Overload Remove Load 2102 (This ONLY pertains to 8 & 9kW units)
ALARM
The unit re-cranks 5 times, when load is applied the engine stalls (0 RPM) and has low output voltage (< 180VAC) The unit is most likely overloaded and load should be removed to prevent damage. Inspect the stepper motor and linkage to make sure it's not binding or stuck. Also check for fuel problems such as pinched fuel lines.
Overload Remove Load 2103 (This ONLY pertains to 8 & 9kW units)
ALARM
The unit has attempted to run and accept load 10 times and could not due to an overload condition. Check connected loads for overloading. See above overload alarms for other troubleshooting..
Undervoltage Overload 2299
ALARM
The unit was overloaded and attempted to start with a large load still connected to the generator. The generator cannot ramp up the generator output to normal with a large load connected. The main breaker inside the generator or in the gray door on the side should be turned off while the unit is started and then once up to speed and steady, the breaker can be turned back on to re-connect load. If the engine struggles to accept the load, items should be turned off to decrease the load on the generator. This would only be something that would occur during an ongoing outage where the transfer switch was still connecting the load to the generator.
Stepper Overcurrent 2399
ALARM
The current flow measured in the stepper motor circuit was above spec. Check the stepper motor for operation and check resistances of the stepper coils.
Fuse Problem 2400
ALARM
Missing, blown, or damaged 7.5A ATO type fuse in the controller (located under the rubber USB port flap on the top of the Evolution Controller). This alarm was flashed out of the programming on versions 1.12 and above. If you see this alarm, upgrade the firmware in the controller to a current version (1.20 as of writing this)
Aux Shutdown 2800
ALARM
This only pertains to units with an external shutdown switch or switches installed. New WiFi units come standard with these switches, some (15kW and above) with 2. One located on the back side of the unit and one inside on the firewall. They must be on for the unit to run. If they are both on, check the wiring and connections for problems.
Low Battery
WARNING
The warning is triggered when the battery voltage drops below 12.1 volts for 60 seconds or more. Charger output should be checked as well as the battery should be load tested once charged. Battery could be bad or charger could be faulty.
Battery Problem
WARNING
This warning is triggered when the battery voltage is more than 16 volts or more than 600mA of charge current is detected at the end of an 18 hour charge cycle. Battery should be removed and tested. If bad, replace. Note that as of writing this, the only way I know how to clear this alarm is by removing a battery terminal from the battery, and then unplugging the T1 2-wire white colored connector under the controller. This will power cycle the controller and reset the alarm. If it returns, further investigation into the controller may be needed.
Charger Warning
WARNING
Warning is displayed when the battery voltage is below 12.5 volts at the end of an 18 hour charge cycle. Battery should be tested as well as the charger. Note that as of writing this, the only way I know how to clear this alarm is by removing a battery terminal from the battery, and then unplugging the T1 2-wire white colored connector under the controller. This will power cycle the controller and reset the alarm. If it returns, further investigation into the controller may be needed.
Charger Missing AC
WARNING
This is a very common alarm to see during install if the battery was installed before the charger was powered on, or during a power outage where the unit isn't running for some reason. It's displayed when the T1 wire (120V power to the battery charger circuit in the Evolution controller isn't live) If power is out and the unit isn't running this alarm will be triggered since the battery charger is now not getting power from the house. Eventually the battery will die if left for several hours without a charger input. If this is a new installation, all of the control wiring should be checked to make sure that one or more of the wires isn't loose, transposed, or missing completely.. The T1 fuse should also be tested. Another issue could be if the unit had a cold weather breather heater (model 7103) installed which is powered by the T1 wire. If the heater had a problem or is shorted and blew the T1 fuse, you will see this alarm.
Service Schedule A
MAINTENANCE REMINDER
Triggered at the 2 year mark (date from which the unit was powered on) or 200 hours, whichever came first. Proper maintenance should be performed. Valves should be checked at this point and will usually require adjustment.
Service Schedule B
MAINTENANCE REMINDER
Triggered at the 4 year mark (date from which the unit was powered on) or 400 hours, whichever came first. Proper maintenance should be performed. At 400 hours the valves almost certainly need to be adjusted, probably before this!
Color legend for this list:
Displayed Alarm message/Warning message
e-Code number
- Generac Error Code 1900 Under Voltage
- Generac Error Codes List In Order
- Generac Error Code List
- Generac Error Code 1906
- Generac Generators Light Codes
- Generac 20kw Error Code 1505
- Generac Error Codes List Cl
This is a list of the Generac Evolution e-Codes (alarm codes) that you may see on the display. Under each is a brief description of what the problem is and the possible causes.
In Generac's Online Product Support section you can find the specifications, product manuals, frequently asked questions, how-to videos, and more for your product. Online Product Support 24/7/365 CUSTOMER SUPPORT United States & Canada: 888-GENERAC (888-436-3722) International: 1-262-544-4811. Jul 30, 2017 Wiring error (code 2099) did Oak Electric install this unit, if not then this could be an installation issue. Service call is needed, possible charge to the customer if installed by others. Overload Remove Load (code 2100) possible overload condition by to many devices running at the same time.
Overspeed 1205 ALARM This overspeed e-code is for instantaneous overspeed (Hz is over set threshold). This means that the frequency (engine speed) was very high. 75Hz or above on a 60Hz generator, or 62Hz.
If you need more help, please post a new topic with your particular information so that we can help! Make sure to include as much information as possible about what the installation looks like and what the problem is and when it occurs.PLEASE NOTE THAT THIS 2018/2019 UPDATED LIST WAS CUSTOM WRITTEN BY ME (CHRIS FLAGG), FOR THIS SITE AND IF SEEN ELSEWHERE WAS COPIED FROM THIS ORIGINAL POST..THIS LIST IS NOT TO BE COPIED WITHOUT WRITTEN PERMISSION
Controller Fault
ALARM
The controller has an internal problem and should be replaced. No error code number is given for this fault.
Overcrank 1100
ALARM
This is a more common error code. Basically this means that the controller is telling the engine to start, but it cannot start for some reason. The controller has verified that the engine is actually cranking, but not starting. This is most likely fuel or maintenance related.. Check to make sure that the fuel supply is on and if on LP gas, the tank is not empty.
Overcrank 1101 (This ONLY pertains to 8 & 9kW units)
ALARM
The controller has limited the number of starts at 10 to prevent damage to the starter. Fuel and maintenance related items should be checked. Valves are normally a culprit of overcrank alarms..
Overspeed 1200
ALARM
This overspeed e-code is for prolonged overspeed (Hz is over set threshold). This means that for 3 seconds, the frequency (engine speed) was 72Hz or above on a 60Hz unit or 60Hz or above on a 50Hz unit (not a US unit). Most likely cause is a stepper motor or mixer assembly issue. Could have come unplugged, become jammed or anything else that may increase engine speed.
Overspeed 1205
ALARM
This overspeed e-code is for instantaneous overspeed (Hz is over set threshold). This means that the frequency (engine speed) was very high. 75Hz or above on a 60Hz generator, or 62Hz or above on a 50Hz model (again, not a US generator). The same causes as the above overspeed code. Stepper/mixer problems.
Overspeed 1207
ALARM
This is an uncommon overspeed alarm and is a backup to the normal overspeed monitors. This monitors the zero cross timing of the voltage regulator (AVR) to determine the alternator frequency. It's set for 150 Milliseconds of 4500 RPM or higher. It's only used if the normal ignition pulses are not seen by the controller from the 18 wire.
Low Oil Pressure 1300
ALARM
This is the normal shutdown alarm for low oil or low oil pressure and may be caused by a couple of things: 1. The oil level is low and should be checked and filled as needed (most common during extended outages). 2. The low oil pressure (LOP) switch is faulty and the oil pressure should be checked and the switch replaced. 3. Some internal problem with the engine not building oil pressure. This would require an oil pressure test to verify.
High Temperature 1400
ALARM
The high engine temperature switch has closed and shut the unit down for exceeding the engine temp high limit. The unit should be checked for debris blocking the vents that might be restricting airflow. If nothing is found, the high temp switch and its wiring should be checked.
RPM Sensor Loss 1501
ALARM
This RPM alarm is set when a 2 cylinder unit was already running and stalled or lost the RPM signal from the ignition coils. Possible causes could be a fuel issue, the LP tank is empty, 1 or both ignition coils are damaged, or the unit was overloaded quick enough that the engine stalled and set the alarm.
RPM Sensor Loss 1505
ALARM
This RPM alarm is set when a 2 cylinder unit is cranking. It's caused when the controller told the engine to crank, but did not get a signal back that the engine was actually turning. Possible causes are a dead or bad battery, bad starter or wiring to the starter, or ignition coil problems.
RPM Sensor Loss 1511
ALARM
This RPM alarm is set when a single (1) cylinder unit was already running and stalled or lost the RPM signal from the ignition coil. Possible causes could be a fuel issue, the LP tank is empty, ignition coil is damaged, or the unit was overloaded quick enough that the engine stalled and set the alarm.
RPM Sensor Loss 1515
ALARM
This RPM alarm is set when a single (1) cylinder unit is cranking. It's caused when the controller told the engine to crank, but did not get a signal back that the engine was actually turning. Possible causes are a dead or bad battery, bad starter or wiring to the starter, or ignition coil problems.
Underspeed 1600
ALARM
An e-code that's triggered when the engine speed is slowed to 55Hz for a 60Hz unit for 30 seconds (or 40Hz for a 50Hz unit). Most likely problem is that the unit is overloaded or something has tried to turn on that overloaded the unit. Could also be fuel related or a stepper motor throttle control problem .
Underspeed 1603
ALARM
This alarm is triggered when the engine never came up to its rated 3600 RPM speed during startup. Stepper motor and the fuel system should be checked for problems. Make sure the orange fuel selector knob is set to the correct fuel.
Overvoltage 1800
ALARM
The alarm is set when the unit's rated voltage output is exceeded for a prolonged period of time. A voltage test should be done to determine the problem. Most likely a bad AVR (automatic voltage regulator) which is internal to the Evolution control board
Undervoltage 1900
ALARM
e-Code is displayed when the output voltage is below 80% of the unit's rated output for 10 or more seconds. Please note that if the installed firmware is below version 1.12 you should update the firmware before going further. Frost or debris on the slip rings can cause a bad connection to the brushes where version 1.11 and below would shut the unit down before attempting to 'clean' the slip rings during running. Version 1.12 and above will run the unit with excitation voltage for 4 minutes before shutting down for undervoltage.
Undervoltage 1901
ALARM
A sudden drop in voltage will set this alarm. This can also occur during a stall condition which may be fuel related and can throw troubleshooting in the wrong direction. All engine functions should be checked as well as voltage. Causes could also be a stator or rotor problem, brush problem, unit being overloaded, or wiring problems. Firmware v1.12 or higher should also be installed before going further.
Undervoltage 1902
ALARM
Fault is displayed when both zero crosses are missing from the controller's input for 1.5 seconds or more. Could be a faulty excitation winding, zero cross circuit, loose wiring, or field boost hardware problem. Same applies here, v1.12 or later firmware should be installed.
Undervoltage 1906
ALARM
Same basic alarm as above, however only 1 zero cross is missing for 1.5 sec instead of both. See Undervoltage 1902 above for causes and troubleshooting.
Wiring Error 2099
ALARM
The controller's wiring on the customer side is most likely miswired. This is normally caused when the high and low voltage wiring connections (194, 23, N1, N1 and T1) are confused during the installation. Normally this alarm won't appear after the initial install since that wiring doesn't normally change after the installation.
Overload Remove Load 2100
ALARM
Alarm is triggered when the unit is overloaded and the internal CT (current transformers) detected an overload condition. This should be 1 or both CT's that detected the problem. The loadshed modules (if in use) should be checked, load should be removed, or load shedding should be installed to prevent the overload from happening.
Overload Remove Load 2102 (This ONLY pertains to 8 & 9kW units)
ALARM
The unit re-cranks 5 times, when load is applied the engine stalls (0 RPM) and has low output voltage (< 180VAC) The unit is most likely overloaded and load should be removed to prevent damage. Inspect the stepper motor and linkage to make sure it's not binding or stuck. Also check for fuel problems such as pinched fuel lines.
Overload Remove Load 2103 (This ONLY pertains to 8 & 9kW units)
ALARM
The unit has attempted to run and accept load 10 times and could not due to an overload condition. Check connected loads for overloading. See above overload alarms for other troubleshooting..
Undervoltage Overload 2299
ALARM
The unit was overloaded and attempted to start with a large load still connected to the generator. The generator cannot ramp up the generator output to normal with a large load connected. The main breaker inside the generator or in the gray door on the side should be turned off while the unit is started and then once up to speed and steady, the breaker can be turned back on to re-connect load. If the engine struggles to accept the load, items should be turned off to decrease the load on the generator. This would only be something that would occur during an ongoing outage where the transfer switch was still connecting the load to the generator.
Stepper Overcurrent 2399
ALARM
The current flow measured in the stepper motor circuit was above spec. Check the stepper motor for operation and check resistances of the stepper coils.
Fuse Problem 2400
ALARM
Missing, blown, or damaged 7.5A ATO type fuse in the controller (located under the rubber USB port flap on the top of the Evolution Controller). This alarm was flashed out of the programming on versions 1.12 and above. If you see this alarm, upgrade the firmware in the controller to a current version (1.20 as of writing this)
Aux Shutdown 2800
ALARM
This only pertains to units with an external shutdown switch or switches installed. New WiFi units come standard with these switches, some (15kW and above) with 2. One located on the back side of the unit and one inside on the firewall. They must be on for the unit to run. If they are both on, check the wiring and connections for problems.
Low Battery
WARNING
The warning is triggered when the battery voltage drops below 12.1 volts for 60 seconds or more. Charger output should be checked as well as the battery should be load tested once charged. Battery could be bad or charger could be faulty.
Battery Problem
WARNING
This warning is triggered when the battery voltage is more than 16 volts or more than 600mA of charge current is detected at the end of an 18 hour charge cycle. Battery should be removed and tested. If bad, replace. Note that as of writing this, the only way I know how to clear this alarm is by removing a battery terminal from the battery, and then unplugging the T1 2-wire white colored connector under the controller. This will power cycle the controller and reset the alarm. If it returns, further investigation into the controller may be needed.
Charger Warning
WARNING
Warning is displayed when the battery voltage is below 12.5 volts at the end of an 18 hour charge cycle. Battery should be tested as well as the charger. Note that as of writing this, the only way I know how to clear this alarm is by removing a battery terminal from the battery, and then unplugging the T1 2-wire white colored connector under the controller. This will power cycle the controller and reset the alarm. If it returns, further investigation into the controller may be needed.
Charger Missing AC
WARNING
This is a very common alarm to see during install if the battery was installed before the charger was powered on, or during a power outage where the unit isn't running for some reason. It's displayed when the T1 wire (120V power to the battery charger circuit in the Evolution controller isn't live) If power is out and the unit isn't running this alarm will be triggered since the battery charger is now not getting power from the house. Eventually the battery will die if left for several hours without a charger input. If this is a new installation, all of the control wiring should be checked to make sure that one or more of the wires isn't loose, transposed, or missing completely.. The T1 fuse should also be tested. Another issue could be if the unit had a cold weather breather heater (model 7103) installed which is powered by the T1 wire. If the heater had a problem or is shorted and blew the T1 fuse, you will see this alarm.
Service Schedule A
MAINTENANCE REMINDER
Triggered at the 2 year mark (date from which the unit was powered on) or 200 hours, whichever came first. Proper maintenance should be performed. Valves should be checked at this point and will usually require adjustment.
Service Schedule B
MAINTENANCE REMINDER
Triggered at the 4 year mark (date from which the unit was powered on) or 400 hours, whichever came first. Proper maintenance should be performed. At 400 hours the valves almost certainly need to be adjusted, probably before this!
Color legend for this list:
Displayed Alarm message/Warning message
e-Code number
Generac Error Code 1900 Under Voltage
Description and possible causes/fixesIf you blink you may miss it. That may be a bad pun, but it is the truth when it comes to Onan generators. When something goes wrong, the generator will send out a code to tell you the problem. If you blink, you may miss the number of the error code.
How to Read Onan Generator Fault Codes: It’s not hard to read the Onan Fault Code blink system, once you get used to it. They use a blink and pause design to make their numbered codes clear and not confusing. For example, if the light blinks 5 times then pauses, then blinks 1 more time, that signifies Fault Code 51.
Generac Error Codes List In Order
To learn more about the different Onan Fault Codes, what they mean and how to fix the problem, just keep reading our article. All the information is here for you to learn from. Onan Fault Codes are easy to learn if you do not blink while they are sending their message.
Onan Generator Blink Code 101
Onan Generator Fault Code List
Code 2 - Low Oil Pressure
This code will only blink twice. It shows that the generator is low on oil and you need to add more. Twist off the yellow cap to look at the gauge and see how much more you need to put in.
Just remember to not over-fill your oil tank. Too much oil is not a good thing
Code 3 - Service Check
When you see this code, it indicates that there is a problem somewhere on your Onan generator. You will get 3 flashes then a pause, then 3 flashes, then a pause and on it goes till you press the button to get the secondary code.
Generac Error Code List
The secondary code will give you the specific problem that is wrong with your generator
Code 4 - Over Crank
The first thing you need to do when you see this code is to try to reset your control board. You do this by turning the switch off and then hit the reset button. Next, you need to turn the switch back to run. If it starts you are fine. If it doesn’t and the code returns, then you need a new control board
Code 12 - Over Voltage
This problem comes from a faulty inverter and that part is overcharging the generator. The only way to solve this Fault Code problem is to take the generator to a qualified Onan dealer or repair shop.
Alternative sources for this code may be a lack of fuel or a clogged filter problem. Then you just add more fuel or replace/clean the filter
Code 13 - Under Voltage
This code tells you that the controller is incapable of maintaining proper voltage levels. There is a simple fix to this problem. Unplug all unneeded appliances while the air conditioner and battery charger are running.
Another source for this problem would be that the engine slowed down for a variety of reasons like a lack of fuel.
Code 14 - Over Frequency
This code tells you that the engine is running too fast and the sources for this code could be one of the following reasons: air leak at the intake, carb, and linkages not properly installed, misadjusted governor, broken governor.
Check your frequency levels first. Then clean or replace your carb, check to make sure the linkage is not reversed or replace the governor. For more info, read our Onan generator fault code 14 guide.
Code 15 - Under Frequency
This is the opposite of the above code. When you see this number, your engine is running too slow. The solution may be that everything was not connected properly or that the governor is in the wrong spot. It has to be in the 5thnotch from the right.
If the generator still flashes, you may have restarted your generator in under a minute and are running in ERO mode. You get the engine running but no power in this mode. Turn the generator off and wait for at least 2 minutes before restarting.
Code 19 - Governor Actuator Overload
The governor has one wire to the controller and one wire for ground. If either one is loose, that will trigger this code. All you have to do is tighten the loose wire and you should be good to go.
If that doesn’t work or the wires are tight, the manual states that you are to go to a certified Onan repairman and get the problem looked at.
Code 23 - Low Oil Pressure Cutoff Switch
This code would indicate a problem with the cutoff switch itself. There is a malfunction in the switch and you probably won’t be able to fix it yourself.
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The manual states that you need to go to the nearest certified Onan dealer to get the problem solved for you. There will be a lot of these type of solutions throughout this code explanation
Code 27 - Voltage Sense Error
What this fault code tells you is that the controller cannot sense the output voltage. Again, this problem may be beyond your expertise to repair. The manual states that the only solution is to go to your authorized Onan dealer to rectify the issue.
Code 29 - High Battery Voltage
This is the simple way to say that the voltage across your battery system is more than 19 volts. What you need to do is check your battery bank connections and if necessary, reconnect them in the proper order.
12-volt connections need to be parallel and 24-volt connections are done n a series. Another solution would be to set a lower battery boost charge rate
Code 31 – Overspeed
3 flashes, a pause and then one flash tells you that your Onan generator is going faster than 3,400 rpm. The trick here is to make sure you do not confuse 13 with 31. You can double-check by pressing the stop button 3 times in 5 seconds.
Once you return to the initial 3 flashes press the stop button again to get the secondary code to double-check your first reading. When you confirm the 31 code, you need to take the generator to the certified Onan dealer to get it fixed
Code 32 - Low Cranking Speed
This code informs you that your cranking speed is below 180 rpms for 2 seconds. To solve this problem, you need to clean the battery connections, or recharge/replace the batteries or replace the engine oil with the proper viscosity
Generac Error Code 1906
Code 35 - Control Card Failure
During a self-test you may see this code pop up. The generator is telling itself that there is an error in the microprocessor EEPROM. You won’t be able to fix this issue and need to take it to the certified Onan dealer near you.
Code 36 - Engine Stopped
That is without command by you. You could be out of fuel or you have a low LPG pressure issue, or your spark plug leads may be loose, or you have bad spark plugs. Finally, you may have to clean or replace the air cleaner or check for some other mechanical failure.
Code 37 - Invalid Generator Set Configuration
This simple message simply says that your Onan generator is set at the wrong frequency. To correct this issue, you should see your certified Onan dealer. They have the right tools to handle this problem
Code 38 - Over Current (Field Overload)
Or in simple English, you have too many appliances running at the same time. Also, you should check your air conditioner and other appliances to make sure there is not a problem with them.
Generac Generators Light Codes
Code 41 - Generator Rotor
Your controller is not sensing either field or output voltage. This is probably another issue you will not be able to fix yourself and the manual says for you to take your generator to an authorized Onan dealer for repairs.
Code 42 – Processor
This number tells you that your Onan generator detected an error within its Microprocessor Rom section. Again, you should not tackle this problem yourself but take your generator to your nearest certified Onan dealer.
Code 43- Processor Fault Code.
There is a problem with the Microprocessor RAM and see above to find the fix. Kodi download for mac os x 10.6 8.
Code 45 - Speed Sense
All this fault code is saying is that your controller is not sensing the quadrature frequency. The simple fix for this issue is for you to bring your generator into the certified Onan dealer’s shop and let them fix it for you.
Code 47 – Ignition
Once again the issue lies with the controller. It is not in bad shape, but it cannot sense any ignition when you try to start your generator. This also is an issue for your certified Onan dealer to handle.
Code 48 - Generator Field Sense
Once again, the controller is unable to sense a vital part of your generator’s operating system. This time it is the field voltage that escapes its attention. See your authorized Onan dealer to fix this problem.
Code 51 – Processor
This is another key code telling you that there is a problem with the installed microprocessor. You will need to see your qualified Onan dealer to get this taken care of.
Code 52 - Fuel Injector
Here you have an open or short circuit in your fuel injector. This is another problem the manual says you need to take to your Onan dealer to get it taken care of.
Code 54 - MAT Sender
The MAT sender has an open or short circuit in it and it may be beyond your abilities to fix yourself. The manual states to bring your generator to your trusty Onan dealer to fix.
Code 56 - MAP Sender
This is not the same as the MAT. But the problem is the same with an open or short circuit in your MAP sender. The solution is the same as your Mat solution.
Code 57 - Over Prime
When your prime mode goes past 3 minutes, then this error code will appear. Check for and then remove any object that may be keeping the control switch in the prime position
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Code 58 - Exhaust Gas Temperature Shutdown
What causes this error code is a lean fuel supply, restricted exhaust system, bad ignition system, bad heat sensor, and other issues. To keep your warranty valid, you need to take your generator to your Onan dealer for diagnosis and repair.
Code 81 - Exhaust Gas Temperature Sensor Open
This may mean that your temperature sensor is stuck open and will not close. It is best if you take your generator to your local Onan dealer to have them repair the problem
Code 82 - Exhaust Gas Temperature Shorted
You have a possible short circuit and it is a problem you should not deal with yourself. Your local authorized Onan dealer has the tools and expertise to fix this issue for you
Onan Generator Code Reset
Resetting your Onan Generator is not that difficult. All you have to do is follow these simple steps and you should be fine:
- Locate the primer button. This doubles as the start and stop button on your generator
- Hold the button down for about 30 seconds- Release the button and then start your generator
- Run the generator for 15 minutes to see if the code has been cleared. If not, then you may need the help of a qualified nan repairman to fix the problem
Some Final Words
Technology does bring a lot of wonderful toys to your life. It also helps make your life a little simpler. But the one drawback to new technology is that there is always some new problem that can arise.
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That is why learning and understanding fault codes is so important. Once you learn and understand them you know what you have to do to solve the problem That knowledge also makes life a little simpler to live
Don’t be afraid of technology, learn how to use it and learn the fault codes so you know what needs to be done next before you cause more problems that may raise your repair costs.