Controller shows E13, generator shuts down shortly after start

Safety first: Allow the engine to cool completely before opening the cooling system. Hot coolant can cause severe burns.

• Step 1 – Check coolant level: Remove the radiator cap when cool and verify coolant is at the proper level. Also check the overflow reservoir. Top up with the correct coolant mixture if low.
• Step 2 – Inspect for leaks: Look around the radiator, hoses, clamps, and water pump weep hole for signs of dried coolant or wet spots. Tighten clamps and replace cracked hoses. A leaking water pump must be replaced.
• Step 3 – Inspect coolant level sensor: Many Multiquip units have a level sensor in the radiator or expansion tank. Check the connector for corrosion and secure fit. Clean contacts and reseat.
• Step 4 – Test sensor: Disconnect the sensor and check its resistance or continuity per the service manual. If readings are out of spec, replace the sensor.
• Step 5 – Clear code and test: After correcting coolant level and sensor issues, clear E13 and run the generator while monitoring for leaks and temperature. If the code returns with correct coolant level, have a technician verify sensor wiring back to the controller.