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81-54

Code 81-54 VFD System Lockout - Unbalance PFCM

Carrier · Air Conditioners & Heat Pumps

What does 81-54 mean?

The current in the Power Factor Correction Module (PFCM) circuits was unbalanced multiple times, leading to a system lockout for 4 hours. This applies to 4 and 5 ton models.

Common Causes

  • Disconnected reactor.
  • Faulty reactor.
  • Internal VFD issue.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Cycle power to the system by turning off the circuit breaker for 30 seconds and then turning it back on to clear the lockout timer.

  2. 2

    Observe if the fault clears and the system resumes normal operation.

  3. 3

    If the fault reoccurs, a professional technician should inspect and test the reactors for proper connection and resistance.

  4. 4

    If reactors are found to be faulty or disconnected, they will need to be replaced by a qualified technician.

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

Related Faults

14-94Code 14-94 Line Voltage Low — Incoming voltage is too low15-94Code 15-94 Line Voltage High — Incoming voltage is too high17-06Code 17-06 Lost BTM Communication — Bluetooth module not communicating with control board
Source: Carrier Air Conditioners & Heat Pumps
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