Controller displays 'Low Coolant' or 'Coolant Level Low' on liquid-cooled GE standby generators.

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

• 1. Inspect for visible leaks: Look under the generator and around hoses, radiator, and water pump for dried coolant residue or wet spots. Tighten hose clamps and replace cracked hoses.
• 2. Check radiator and overflow bottle: Remove the radiator cap when cool and verify coolant is at the neck. Check the overflow reservoir level and fill to the indicated mark with the correct coolant mix.
• 3. Examine coolant level sensor: Locate the coolant level sensor in the radiator or reservoir. Ensure the connector is tight and free of corrosion. Clean the sensor contacts if accessible.
• 4. Bleed air if system was low: After refilling, run the engine briefly with the cap off (if design allows) to purge air, then top off and reinstall the cap securely.
• 5. Clear alarm: Cycle the controller OFF then AUTO to clear the Low Coolant Level alarm. If the alarm returns quickly, the sensor or wiring may need replacement.