Pramac standby generator shows E09 and stops producing power

Safety first: Isolate the generator from the load by opening the output breaker or ATS. Turn the unit OFF and disconnect battery negative before opening panels.

• Inspect AVR connections: Locate the AVR in the alternator terminal box. Check all spade and screw terminals for tightness and signs of overheating.
• Check sensing leads: Verify that the voltage sensing wires from the alternator output to the AVR and controller are intact and correctly landed.
• Visual AVR check: Look for burnt components or discoloration on the AVR board. If present, replace the AVR with a Pramac-approved part.
• Do not adjust blindly: Some AVRs have trim pots for voltage. Only adjust according to the Pramac service manual using an accurate voltmeter. Incorrect adjustment can damage connected equipment.
• Professional testing: If wiring and AVR appear normal but E09 persists, alternator excitation or controller sensing circuits may be faulty. Contact a qualified technician.