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Midea M-Thermal Arctic HT R290 Mono fault E9

Th return-air temperature sensor error

Heat pump

What it means

Fault relating to the Th return-air temperature sensor.

Likely causes

  1. Sensor fault or wiring fault at CN5 port
  2. Set temperature reached

Where to start

  1. Check sensor connection at CN5 port on the PCB
  2. Monitor discharge temperature (Tp) and suction temperature (Th) during compressor operation
  3. Track compressor running time against 12 minute threshold for EA logic

The full answer, free

  • 8 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 108), right under the answer
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Safety: Isolate the outdoor unit and any backup heater, and give the inverter capacitors time to discharge before you open the electrics. Anything on the refrigerant circuit needs F-gas certification.

From the Midea manual for the M-Thermal Arctic HT R290 Mono. Check the model on the data plate before you order parts.

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