Indoor unit shows E5 and system will not run or shuts down shortly after starting.
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.
Possible Causes
How to Fix / Troubleshooting
Safety first: Turn off all power to the system. Overcurrent faults can indicate serious electrical hazards.
User-level checks:
- Check supply voltage: Have a qualified person verify that supply voltage at the disconnect matches the nameplate rating and that the breaker is correctly sized.
- Inspect wiring: With power OFF, inspect the outdoor unit's wiring compartment for loose lugs, burnt wires, or melted insulation. Tighten loose terminal screws if you are comfortable and qualified.
When to call a pro: If E5 persists, the compressor or outdoor inverter control board may be failing. These are advanced repairs that require an HVAC technician with electrical and refrigeration expertise.
Repair Difficulty
Required Part
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