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T175

T175 — Loss of communication with VFD

Carrier · Energy Recovery Ventilators

What does T175 mean?

Communication has been lost with the Variable Frequency Drive (VFD), causing the unit to shut down.

Common Causes

  • Bad communication connection
  • Miswired VFD
  • Misconfigured VFD

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the VFD communication connections for tightness and correctness.

  2. 2

    Verify the VFD is wired correctly.

  3. 3

    Ensure the VFD configuration settings are appropriate for the system.

  4. 4

    Reset the unit after checking 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
Open Manual (Page 47)Search more codes in this manual