E55
Compressor Under Dome Thermistor Disconnected
Mitsubishi Electric · FR-D700 Inverter
What does E55 mean?
The thermistor located under the compressor dome is disconnected, which will prevent critical temperature monitoring of the compressor shell. This can lead to undetected compressor overheating and failure.
Common Causes
- Disconnection of the compressor under-dome thermistor.
- Open circuit fault in the compressor under-dome thermistor sensor.
- Faulty compressor under-dome thermistor causing an erroneous temperature reading.
Repair Steps & Checklist
Click steps to track your progress.
- 1
Inspect the compressor under dome thermistor connection for dislodgement or damage.
- 2
Measure the resistance of the thermistor to verify functionality and compare to the specified temperature-resistance chart.
- 3
Ensure the thermistor is securely connected and making proper thermal contact with the compressor dome.
Verified technical data. Last updated: March 2026
Related Faults
Source: Mitsubishi Electric FR-D700 Inverter