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Midea R32 M thermal Arctic Mono fault E9

Suction pipe temperature sensor error

Heat pump

What it means

Suction pipe temperature sensor error (serial number 10), sensor Th. Displayed on user interface and refrigerant system main PCB.

Likely causes

  1. Sensor Th disconnected, sensor malfunction, wiring break, PCB connection issue
  2. Sensor Th fault
  3. Sensor wiring fault

Where to start

  1. Check sensor Th connection, measure sensor resistance, verify wiring continuity, test sensor response
  2. Identify sensor type based on fault code
  3. Identify outdoor unit model variant (MHC-V4(6,8,10)W/D2N8-B, MHC-V12(14,16)W/D2N8-B, or MHC-V12(14,16)W/D2RN8-B)

The full answer, free

  • 10 more checks in order
  • The readings and component tests from the manual
  • The manual page for this fault (page 66), 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 R32 M thermal Arctic Mono. Check the model on the data plate before you order parts.

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