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T074

T074 - Space Temperature Thermistor Failure

Carrier · Air Conditioning

What does T074 mean?

The sensor measuring the indoor space temperature has failed. The unit will shut down to prevent incorrect operation.

Common Causes

  • Faulty thermistor
  • Wiring error to the thermistor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that the space temperature sensor is not blocked by furniture or other objects.

  2. 2

    Inspect wiring connections to the sensor.

  3. 3

    A technician will need to test and potentially replace the space temperature thermistor.

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

Related Faults

A051A051 - Compressor 1 Stuck On FailureA052A052 - Compressor 2 Stuck On FailureA055A055 - Compressor 1 Stuck On Failure (Circuit B)
Source: Carrier Air Conditioning
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