5104 (1202) Temperature sensor fault - Outside temperature (TH24)

What does 5104 (1202) mean?

This fault refers to a problem with the outside temperature sensor (TH24) for the indoor unit. A defective thermistor or a loose connection can cause this, leading to incorrect outdoor temperature readings for the indoor unit's control.

• Defective thermistor (TH24).
• Loose or poor contact of the thermistor connector.
• Faulty indoor board if no other issues are found.

Click steps to track your progress.

1. 1

   Turn off the power to the indoor unit at the circuit breaker.

2. 2

   Check the connector for the TH24 thermistor on the indoor unit to ensure it is securely connected.

3. 3

   Visually inspect the thermistor's lead wire for any visible damage.

4. 4

   Restore power to the unit. If the error persists, note the ambient temperature.

5. 5

   A technician would typically check the thermistor resistance at different temperatures (e.g., 0°C, 10°C, 20°C, 30°C, 40°C) against specified values (15kΩ, 9.7kΩ, 6.4kΩ, 4.3kΩ, 3.1kΩ respectively).