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Midea R32 M thermal Arctic Mono fault P5

High temperature difference between water side heat exchanger water inlet and water...

Heat pump

What it means

Error code 25. Protection triggered by high temperature difference between water side heat exchanger inlet and outlet temperatures, detected by user interface and hydronic system main PCB.

Likely causes

  1. Water piping contains air
  2. Insufficient water flow rate in cooling mode
  3. Low water flow rate
  4. Pump fault
  5. Insufficient refrigerant caused by refrigerant leakage
  6. Low pressure side blocked by crushed or bent pipe, blocked EXV, or dirty filter
  7. Poor air side heat exchanger heat exchange in heating or DHW mode

Where to start

  1. Repair or replace crushed/bent water piping
  2. Adjust pump speed setting
  3. Perform air purging procedure on water system

The full answer, free

  • 30 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • 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.

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