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Midea R32 M thermal Arctic Mono fault HB

PP protection three times in a row and twout < 7°C

Heat pump

What it means

Error code 50. Triggered when PP protection occurs three times in a row and Twout is less than 7°C. Detected by user interface and hydronic system main PCB.

Likely causes

  1. Temperature sensor not connected properly or has malfunctioned
  2. 4-way valve is blocked or damaged
  3. Hydronic system main PCB damaged
  4. Repeated PP protection triggering
  5. Low water outlet temperature

Where to start

  1. Identify sensor type based on fault code
  2. Locate corresponding port on hydronic system main PCB
  3. Check connection at identified port

The full answer, free

  • The readings and component tests from the manual
  • The manual page for this fault (page 67), 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.

Other Midea R32 M thermal Arctic Mono fault codes