Generator shuts down and displays E007 Low Coolant Level

Safety first: Allow the engine to cool fully before opening any part of the cooling system. Pressurized hot coolant is dangerous.

• Inspect coolant level: Check the expansion tank and radiator (when cool). If low, top up with the specified coolant mix and note how much is added.
• Look for external leaks: Examine radiator, hoses, clamps, water pump weep hole, and heater lines for wet spots or dried coolant residue. Tighten clamps and replace cracked hoses.
• Check coolant level sensor: Many Atlas Copco sets use a float or probe in the expansion tank. Remove and clean the sensor, checking for sludge buildup. Test continuity or resistance per the service manual and replace if faulty.
• Pressure test system (advanced): A cooling system pressure test can reveal small leaks. This is best done by a technician.
• Monitor level: After refilling, run the generator and recheck the level after cool‑down. Rapid loss indicates a significant leak or internal engine fault.

Do not bypass the coolant level sensor for normal operation. Persistent coolant loss requires professional investigation.