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Midea R32 M thermal Arctic Mono fault ED

Water side heat exchanger water inlet temperature sensor error

Heat pump

What it means

Water side heat exchanger water inlet temperature sensor error (serial number 14), sensor Tw_in. Displayed on user interface and hydronic system main PCB.

Likely causes

  1. Sensor Tw_in fault
  2. Sensor wiring fault
  3. Main board fuse damaged/blown
  4. Insufficient refrigerant caused by refrigerant leakage
  5. Low pressure side blocked by crushed or bent pipe, blocked EXV, or dirty filter
  6. Poor air side heat exchanger heat exchange in heating or DHW mode
  7. Insufficient water flow rate in cooling mode
  8. Outdoor main PCB fault (last resort)
  9. Inverter module damaged
  10. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions
  11. Crushed or bent pipe
  12. Blocked EXV
  13. Dirty filter

Where to start

  1. Check sensor Tw_in and its wiring
  2. Identify sensor type based on fault code
  3. Locate corresponding port on refrigerant system main PCB for that model

The full answer, free

  • 67 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 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.

Other Midea R32 M thermal Arctic Mono fault codes