E8
Mitsubishi Electric
Indoor Fan Overcurrent or PCB Overload Protection
Indoor unit shows E8, unit may stop during operation, sometimes related to overcurrent
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Indoor fan motor drawing excessive current, Blocked air filter and coil causing overload, Faulty indoor PCB current sensing circuit, Shorted fan motor winding
How to Fix / Troubleshooting
Safety first: Turn off power at the breaker before cleaning or disassembling.
Steps:
- Clean filters and coil: Remove and wash air filters. If the evaporator coil is clogged with dust, carefully vacuum or brush it. Restricted airflow can cause fan overload.
- Check fan rotation: Ensure the cross-flow fan spins freely by hand. Remove any debris and verify that it is not rubbing against the housing.
- Inspect motor and wiring: Look for signs of overheating on the motor (discoloration, smell) and check the harness for damage.
- Current check (technician): A technician can measure fan motor current draw and compare it to the rated value. Excessive current indicates a failing motor.
- Replace motor or PCB: If the motor is confirmed faulty, replace it. If current is normal but E8 persists, the indoor PCB’s current sensing circuit may be defective and require replacement.
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Repair Difficulty
Medium
3/5
Required Part
Indoor Fan Motor
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