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Midea R32 M thermal Arctic Mono fault H3

Water side heat exchanger refrigerant outlet temperature sensor error

Heat pump

What it means

Water side heat exchanger refrigerant outlet temperature sensor error (serial number 42). Sensor T2B.

Likely causes

  1. Sensor T2B fault
  2. Sensor wiring fault
  3. Sensor T2B 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 T2B

Where to start

  1. Check sensor T2B connection, measure sensor resistance, verify wiring continuity, test sensor response
  2. Identify sensor type based on fault code
  3. Locate corresponding port on hydronic system main PCB

The full answer, free

  • 2 more checks in order
  • 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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