Generator runs but E09 displayed and output voltage is too low or unstable

Safety first: Disconnect all loads, open the main breaker, and shut down the generator. Disconnect battery negative before opening panels.

• Measure no‑load voltage: Start the generator with no load and measure output. If voltage is normal with no load but drops severely under small load, suspect a weak AVR or stator issue.
• Inspect output lugs: Tighten all output terminal bolts and check for heat discoloration or melted insulation. Clean and re‑terminate any overheated connections.
• Check for overload: Confirm that the connected load does not exceed the generator's continuous rating. Remove large motor loads and retest.
• Replace AVR: If wiring and load are correct but voltage remains low or unstable, replace the AVR with a DuroMax‑approved unit.
• Stator testing: If a new AVR does not fix the problem, a stator winding may be shorted. This requires resistance and insulation testing by a qualified technician and likely stator replacement.