Outdoor Heat Exchanger Thermistor 3 Failure (Tho-R3)

Hva betyr E37-3 ?

The third outdoor heat exchanger thermistor (Tho-R3) is defective. This prevents accurate temperature measurement of a specific section of the outdoor coil, impacting system control and protection.

• Outdoor heat exchanger thermistor 3 (Tho-R3) has failed.
• Wiring to Tho-R3 is broken or shorted.
• Tho-R3 reading is out of specified limits.
• Defective Tho-R3 thermistor.

Klikk på steg for å spore fremgangen.

1. 1

   Measure the resistance of thermistor Tho-R3 at its leads — compare to a resistance-temperature chart if available.

2. 2

   Inspect the connector for Tho-R3 on the outdoor unit PCB — verify it is securely seated and free from corrosion.