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. medium	medium
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	Code 1501 specifically indicates the oil pressure sensor circuit has a fault - either open circuit, short circuit, or reading out of expected range. Unlike 1505 which indicates actual low oil pressure, 1501 is a sensor circuit problem. medium	medium
1505	Code 1505 indicates the engine oil pressure dropped below the safe operating threshold while the engine was running. Generac's controller immediately shuts down the engine to prevent catastrophic bearing damage. This is a critical safety shutdown. 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	Code 2099 means engine speed exceeded safe limits. The governor lost control and engine RPM rose above the maximum threshold, triggering immediate shutdown. 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 indicates the 12V starting battery voltage has dropped below the minimum threshold. Without adequate battery voltage, the generator cannot crank the engine. medium	medium
2780	Code 2780 indicates the ignition system is not producing adequate spark. The controller detected cranking without successful ignition events. 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	Complete reference for all Generac standby generator alarm and fault codes. Generac uses numeric error codes displayed on the Evolution or Nexus controller panel, with codes ranging from 0 to 2800+. medium	medium