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A055

A055 - Compressor 1 Stuck On Failure (Circuit B)

Carrier · Air Conditioning

What does A055 mean?

This alarm indicates that Compressor 1 in Circuit B is stuck in the 'on' position. The system will turn off all compressors.

Common Causes

  • Welded contact in the compressor control circuit

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check for any external shutdown commands.

  2. 2

    Inspect the wiring to Compressor 1 in Circuit B for damage or loose connections.

  3. 3

    If the issue persists, contact a qualified HVAC technician to diagnose the compressor control.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

A051A051 - Compressor 1 Stuck On FailureA052A052 - Compressor 2 Stuck On FailureA056A056 - Compressor 2 Stuck On Failure (Circuit B)
Source: Carrier Air Conditioning
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