E5
Fraser-Johnston
Overcurrent Protection / Compressor Overload
E5 error, compressor does not start or shuts down quickly
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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
Shorted compressor windings, Locked rotor compressor, Weak or failed run capacitor, High supply voltage or loose power connections
How to Fix / Troubleshooting
Safety: This involves high voltage and potentially high current. Turn off power at the main breaker and outdoor disconnect. Use proper PPE.
- Inspect power connections: Remove the condenser electrical panel. Check L1/L2 connections for tightness and signs of overheating (discoloration, melted insulation). Tighten or repair as needed.
- Test run capacitor: Discharge the capacitor safely, then test with a capacitance meter. Replace if more than ±10% off the rated µF or if bulged/leaking.
- Check compressor amps: With a clamp meter and power restored, measure compressor starting and running amps. If locked rotor amps are sustained and E5 trips, the compressor may be mechanically locked.
- Check supply voltage: Verify voltage at the contactor. High or low voltage outside nameplate range can cause overcurrent.
- If compressor is shorted or locked: Replacement of the compressor or entire Fraser‑Johnston condenser unit is typically required and should be done by a professional.
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Repair Difficulty
Professional Required
5/5
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