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ErrorLib — Industrial Fault Code Library

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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. 1

    Inspect the compressor under dome thermistor connection for dislodgement or damage.

  2. 2

    Measure the resistance of the thermistor to verify functionality and compare to the specified temperature-resistance chart.

  3. 3

    Ensure the thermistor is securely connected and making proper thermal contact with the compressor dome.

Browse all codes in this manual (78)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric FR-D700 Inverter
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