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A056

A056 — Circuit B, Compressor 2 Stuck On Failure Alarm

Carrier · 38AP Air Handler

What does A056 mean?

This alarm indicates that Compressor 2 on Circuit B is stuck in the 'on' position. All compressor outputs are de-energized, but head pressure control remains active. Manual reset is necessary.

Common Causes

  • Compressor 2 is failing to turn off
  • Electrical fault keeping Compressor 2 energized
  • Control board malfunction

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Manually reset the alarm.

  2. 2

    Inspect Compressor 2 and its control circuits.

  3. 3

    Verify that the compressor is properly de-energized when commanded off.

  4. 4

    Seek professional service if the issue persists.

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

Related Faults

A051A051 — Circuit A, Compressor 1 Stuck On Failure AlarmA052A052 — Circuit A, Compressor 2 Stuck On Failure AlarmA053A053 — Circuit A, Compressor 3 Stuck On Failure Alarm
Source: Carrier 38AP Air Handler
Open Manual (Page 163)Search more codes in this manual