The controller shows E06, and the generator will not crank.

Safety first: Ensure the generator is in OFF mode and the main breaker is open. Wear eye protection when working around batteries.

• Step 1 – Visual inspection: Inspect the starting battery for swelling, cracks, or leakage. Check that the positive and negative cables are tight and free of corrosion. Clean terminals with a wire brush and a baking soda solution if corroded, then rinse and dry.
• Step 2 – Measure battery voltage: Using a digital multimeter, measure DC voltage across the battery terminals. A healthy 12V battery should read about 12.6V at rest; below 12.0V indicates a low or failing battery.
• Step 3 – Check battery charger: With AC utility power present, verify that the Multiquip battery charger is powered. Measure voltage at the battery with charger connected; it should be around 13.2–13.8V for a 12V system. If voltage does not rise, check the charger fuse and AC supply. Replace the charger if it has input power but no output.
• Step 4 – Charge or replace battery: If the battery is simply discharged, charge it with an external smart charger until full, then retest. If it will not hold a charge or fails a load test, replace it with a battery of the same group size and CCA rating recommended by Multiquip.
• Step 5 – Clear code and test start: After restoring proper battery voltage, clear E06 on the controller and attempt a manual start. If E06 returns despite a good battery and charger, inspect the DC wiring harness and starter relay.