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A140

A140 - Reverse Rotation Detected

Carrier · Air Conditioning

What does A140 mean?

The system has detected that a fan or compressor is rotating in the wrong direction. The unit will shut down.

Common Causes

  • Incorrect compressor or fan wiring
  • Motor installation error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the installation and wiring of fans and compressors.

  2. 2

    Ensure motor rotation direction matches specifications.

  3. 3

    A qualified technician must correct the wiring if it is reversed.

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 FailureA055A055 - Compressor 1 Stuck On Failure (Circuit B)
Source: Carrier Air Conditioning
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