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T074

T074 — Space Temperature Thermistor Failure Alert

Carrier · 38AP Air Handler

What does T074 mean?

The space temperature thermistor has failed. Space temperature reset functionality will be disabled, and the unit will run under normal set point control. The alert resets automatically when the thermistor functions correctly.

Common Causes

  • Space temperature thermistor failure
  • Wiring issue to the thermistor
  • Faulty control board

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    The unit should attempt automatic reset when the thermistor is functional.

  2. 2

    Check wiring and connections to the space temperature thermistor.

  3. 3

    If the failure persists, the thermistor or control board may need replacement.

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

Related Faults

A051A051 — Circuit A, Compressor 1 Stuck On Failure AlarmA052A052 — Circuit A, Compressor 2 Stuck On Failure AlarmA053A053 — Circuit A, Compressor 3 Stuck On Failure Alarm
Source: Carrier 38AP Air Handler
Open Manual (Page 163)Search more codes in this manual