This is a common error to see displayed on your Generac home standby. Essentially what this means is that the controller is telling the engine to start, but it cannot. The controller has verified that the engine is cranking but not starting. To resolve this issue, you’ll need to reset the controller and restart your unit. If your unit does not start after two automatic attempts, there may be a deeper issue. Make sure the gas to your generator is turned on. You can tell if your gas is turned on if the handle is lined up with the pipe. If your handle is lined across the pipe, the gas is turned off. If the gas is on and your unit is still not working, you’ll need to contact an authorized service dealer.
Overspeed (Code 1201 / 1205)
This code is set off when the controller does not detect the correct RPM. It’s triggered when the engine speed is slowed to 55Hz for a 60Hz unit for 30 seconds (or 40Hz for a 50Hz unit). This could be fuel related or a stepper motor throttle control problem. If your unit is displaying this code, you will need to contact an authorized dealer.
Low Oil Pressure (Code 1300)
When you see this error, the first thing you should do is check your oil level. This error could be the result of a low oil level and if that’s the case, it needs to be filled. If oil is needed, add oil per the recommendation found in your owner’s manual. Be careful not to overfill the engine. If the oil level is good, the error may be the result of a faulty low oil pressure (LOP) switch. The oil pressure should be checked, and the switch replaced. Another possible cause of this error is some internal problem with the engine not building oil pressure. This would require an oil pressure test to verify. If your unit still won’t work, a service call is needed.
RPM Sense Loss (Code 1501 / 1505 / 1511 / 1515)
These error codes will show up if there’s an issue with the cylinder unit. It could have been running and then stalled or lost the RPM signal from the ignition coils. Or the cylinder unit is cranking. Possible causes could be a fuel issue, the LP tank is empty, both ignition coils are damaged, or the unit was overloaded quick enough that the engine stalled and set the alarm. But if the unit is running and suddenly shuts down, you should try to restart it. You can clear the alarm by pressing the ENTER button twice, then press AUTO. Next, remove some of the loads. Try putting it back in AUTO, and then restart it. If the generator still does not run after this, you will need to place a service all. If the generator will not start in AUTO when there is utility loss, clear the alarm by pressing ENTER twice, then press AUTO. Then, using the control panel, check the battery. To do this, go to the MAIN MENU and navigate to the BATTERY MENU option. If it states ‘check battery’, try replacing the battery. If it states that your battery is ‘good’ when being checked, contact an authorized service dealer.
This error occurs when the unit’s rated voltage output is exceeded for a prolonged period.
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.