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Midea R32 M thermal Arctic Mono fault H2

Water side heat exchanger refrigerant inlet (liquid pipe) temperature sensor error

Heat pump

What it means

Water side heat exchanger refrigerant inlet (liquid pipe) temperature sensor error (serial number 41). Sensor T2.

Likely causes

  1. Sensor T2 fault
  2. Sensor wiring fault
  3. Sensor T2 disconnected, sensor malfunction, wiring break, PCB connection issue
  4. Temperature sensor not connected properly or has malfunctioned. Damaged hydronic system main PCB.
  5. Faulty sensor T2

Where to start

  1. Check sensor T2 connection, measure sensor resistance, verify wiring continuity, test sensor response
  2. Verify A,B,X,Y,E terminal wiring matches wire controller connection
  3. Check master/slave unit parallel wiring for correct terminal assignment (H1,H2)

The full answer, free

  • 8 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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