Generac Error Codes

Find troubleshooting guides for all Generac error codes.

15 error codes across 1 appliance types

Generator

Code	Meaning	Severity
0	Code 0 indicates the controller lost communication with one or more sensors or modules. This is a general communication fault similar in concept to a watchdog timeout. moderate	moderate
1100	Code 1100 means the controller lost the RPM signal from the engine speed sensor while the engine was running. Without RPM feedback, the controller cannot regulate engine speed and shuts down as a safety measure. high	high
1300	Code 1300 means the generator detected an electrical overload exceeding its rated capacity. The controller shuts down to prevent damage to the alternator and wiring. high	high
1501	The Evolution controller sent a signal to the oil pressure sensor and didn't get a valid response back. Either the circuit's open (broken wire, bad connection) or it's shorted somewhere. The controller can't verify oil pressure, so it shuts down and throws 1501 to protect the engine from running dry. moderate	moderate
1505	Code 1505 means the engine's oil pressure dropped below the safe threshold while it was running. Generac's controller sees that signal and kills the engine immediately to protect the bearings. Could be real low pressure or a failed switch sending a false signal. critical	critical
1600	Code 1600 means engine speed deviated significantly from the target 3600 RPM. The governor system could not maintain proper speed under the current load conditions. high	high
1603	Code 1603 indicates the controller detected excessive current draw from the governor stepper motor (iSMA). The motor is either shorted or mechanically jammed. high	high
1900	Code 1900 indicates the controller lost the governor position feedback signal. The controller cannot confirm the throttle position. high	high
1902	Code 1902 indicates the electronic governor actuator (also called the stepper motor or iSMA - intelligent Speed Management Actuator) has failed to respond to the controller's speed commands. The governor controls engine speed by adjusting the throttle. high	high
2099	The controller clocked the engine spinning way above 3600 RPM, which is the exact speed needed for 60Hz output. When RPM climbs past the safe threshold, the ECM cuts fuel and shuts down immediately to keep things from flying apart inside the machine. critical	critical
2100	Code 2100 means engine speed dropped below acceptable threshold while running. The engine is bogging down under load. high	high
2400	Code 2400 means the 12V starting battery voltage dropped below the minimum threshold the controller will tolerate. Without enough juice in that battery, the generator can't crank the engine to start, which is basically the whole point of the thing. moderate	moderate
2780	Code 2780 means the ignition system isn't producing adequate spark. The controller detected cranking without successful ignition events, basically the engine turned over but there was nothing to light the fuel-air mix. high	high
2800	Code 2800 on a Generac generator means the engine cranked for the maximum allowed time (typically 10-12 seconds per attempt, 6 attempts) without achieving a stable running speed. The controller detected cranking RPM but never saw running RPM, indicating a fuel delivery or ignition problem. high	high
HUB	Generac uses numeric fault codes displayed on the Evolution or Nexus controller to flag engine and system problems before they cause real damage. The code tells you which system failed. The history log tells you how long it's been failing. Both matter a lot. moderate	moderate