Controller shows F16 Coolant Level Low; generator may not start or may shut down shortly after start.

Safety first: Allow the engine to cool completely before opening the radiator cap or coolant reservoir. Hot coolant under pressure can cause severe burns.

• Check coolant reservoir: Inspect the translucent coolant expansion tank and ensure the level is between MIN and MAX. Top up with the correct coolant mixture if low.
• Inspect for leaks: Look for dried coolant residue or wet spots around the radiator, hose connections, water pump, and engine block. Tighten clamps and replace cracked hoses.
• Bleed air from system: After topping up, run the engine with the radiator cap off (if design allows) until the thermostat opens and air bubbles stop. Refit the cap securely.
• Check coolant level sensor: Locate the level sensor in the radiator or reservoir. Inspect the connector and wiring. If F16 persists with correct coolant level, replace the sensor.
• Retest: Clear F16 and run the generator while monitoring coolant level. If the level drops again, a hidden leak or head gasket issue may exist and should be evaluated by a technician.