On liquid-cooled Eaton standby generators, controller displays “Low Coolant Level” and prevents start or shuts down.

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

Steps:

• Check coolant level: Inspect the coolant level in the overflow tank or radiator (if accessible). Top off with the specified coolant mixture if low.
• Inspect for leaks: Look for dried coolant residue or wet spots around hoses, clamps, radiator core, and water pump. Tighten clamps and replace damaged hoses.
• Check level sensor: Locate the coolant level sensor and inspect its connector and wiring. If the level is correct but the alarm persists, test or replace the sensor.
• Bleed air: If the system was recently serviced, bleed air from high points per the engine manual to prevent false low-level readings.
• Clear alarm and test: After correcting issues, clear the alarm and run the generator while monitoring for leaks.