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OUTDOOR_COMM_FAULT

Outdoor unit communication fault

Bryant · Air Conditioning

What does OUTDOOR_COMM_FAULT mean?

The control system cannot communicate with the outdoor unit. This means the outdoor unit will not function.

Common Causes

  • Wiring issue on the ABCD bus to the outdoor unit
  • Damaged communication cable
  • Outdoor unit control board failure
  • Power issue to the outdoor unit

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Verify the ABCD wiring connections on the outdoor unit are correct and secure.

  2. 2

    Check the communication cable for damage.

  3. 3

    Ensure the outdoor unit is receiving proper power.

  4. 4

    Contact an HVAC technician for further diagnosis.

Browse all codes in this manual (47)
Verified technical data. Last updated: April 2026

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Source: Bryant Air Conditioning
Open Manual (Page 17)Search more codes in this manual