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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. Repeated PP protection triggering
  2. Low water outlet temperature

Where to start

  1. Step 1: Check if water flow switch connection (CN8) on hydronic system main PCB is loose
  2. Step 2: If connection is fine, check the water flow via wired controller spot check flow after water pump is switched on
  3. Step 3: If flow check fails, check water circuit and emptying per note 2

The full answer, free

  • 17 more checks in order
  • 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