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T179

T179 — Loss of communication with the Economizer Control Board

Carrier · Energy Recovery Ventilators

What does T179 mean?

Communication has been lost with the Economizer Control Board (ECB), resulting in no economizer operation.

Common Causes

  • Communication wiring problem with ECB
  • Faulty MBB (Main Board)
  • Faulty ECB

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the communication wiring between the MBB and the ECB.

  2. 2

    Check the MBB for proper function.

  3. 3

    Test the ECB for correct operation.

  4. 4

    Reset the unit after verifying connections.

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

Related Faults

1 Fault CodeFault Code 1 — OVERCURRENT10 Fault CodeFault Code 10 — PANEL LOSS11 Fault Code11 Fault Code — ID RUN FAIL
Source: Carrier Energy Recovery Ventilators
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