E53 - Suction pipe thermistor (Tho-S) disconnected

What does E53 mean?

This error indicates that the suction pipe thermistor (Tho-S) in the outdoor unit is disconnected, leading to incorrect temperature readings.

• Loose or disconnected Tho-S thermistor connector.
• Damaged wiring to the Tho-S sensor.
• Faulty Tho-S thermistor itself.
• Corrosion at the connection points.

Click steps to track your progress.

1. 1

   Turn off the main power supply to the outdoor unit at the circuit breaker.

2. 2

   Have a qualified technician inspect the Tho-S thermistor and its wiring connections in the outdoor unit.

3. 3

   Ensure all connections are secure and inspect for any visible damage to the sensor or wiring.

4. 4

   If the thermistor is faulty, it will need to be replaced by a professional.