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T127

T127 - Circuit B High Head Pressure Alert

Carrier · Air Conditioning

What does T127 mean?

An alert indicating high head pressure in Circuit B. The circuit will stop.

Common Causes

  • Dirty condenser coil
  • Condenser fan failure
  • System overcharged with refrigerant

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Clean the outdoor unit's condenser coils.

  2. 2

    Verify the condenser fan is operating.

  3. 3

    A technician should check the refrigerant levels.

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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