よくある質問
Excavator Code 7421 FAQ
What does excavator code 7421 indicate?
Code 7421 typically indicates a problem with the cooling system, either low coolant levels or a malfunctioning water level switch.
How do I check coolant levels for error 7421?
Locate the coolant reservoir when the engine is cool, check the level against marked indicators, and top up if below minimum with manufacturer-approved coolant.
What should I do if the water level switch is faulty?
First test the switch with a multimeter for continuity. If faulty, replace the switch and ensure proper sealing to prevent future issues.