Generator starts but stops within a few seconds, E04 appears on display

Safety first: Turn OFF the generator and remove the key. Wear eye protection when working around batteries.

• Inspect battery connections: Open the battery compartment on the Scheppach standby generator. Check that the positive and negative terminals are tight and free of corrosion. Clean with a wire brush and apply dielectric grease.
• Test battery voltage: With a multimeter, measure battery voltage at rest. A healthy 12 V battery should read about 12.6 V. If below 12.0 V, charge the battery fully with an external charger.
• Load test battery: If available, use a battery load tester. Replace the battery if it fails the load test or is more than 4–5 years old.
• Check charging circuit: Start the generator (if possible) and measure voltage at the battery. It should rise to around 13.5–14.5 V. If it stays at rest voltage, inspect the engine charging alternator, regulator, and the DC charging fuse on the Scheppach control board.
• Inspect DC fuse and wiring: Locate the DC charging fuse and harness from the engine alternator to the control panel. Replace a blown fuse only after checking for shorts. Repair any damaged wiring.
• Clear E04 and retest: After correcting issues, clear the code via the control panel and test automatic and manual start.