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ErrorLib — Industrial Fault Code Library

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Compressor

Compressor Not Cooling

Otis · 400 Elevator

What does Compressor mean?

Indicates that the compressor is not cooling at a rate of 0.5º C per hour or better while active. This points to a performance issue with the refrigeration system, potentially due to mechanical failure or low refrigerant.

Common Causes

  • Compressor malfunction (e.g., faulty motor, low compression).
  • Refrigerant leak or insufficient refrigerant charge.
  • Restricted airflow to the evaporator or condenser.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Measure supply voltage at compressor input terminals against nominal specifications.

  2. 2

    Verify compressor run command and operational status via system diagnostic interface.

  3. 3

    Inspect refrigeration lines and connections for visible signs of refrigerant leaks, such as oil residue or frost accumulation.

  4. 4

    Verify temperature sensor readings within the refrigeration circuit (e.g., suction, discharge) are accurate and within expected ranges.

  5. 5

    Inspect condenser and evaporator coils for cleanliness and obstructions, ensuring adequate airflow.

Browse all codes in this manual (41)
Verified technical data. Last updated: April 2026

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Source: Otis 400 Elevator
Open Manual (Page 21)Search more codes in this manual