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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. Crushed or bent pipe
  5. Blocked EXV
  6. Dirty filter
  7. Hydronic box main PCB fault
  8. Damaged cables between hydronic box main PCB and outdoor unit main PCB
  9. Outdoor unit main PCB fault
  10. Incorrect or abnormal input power supply (N or L)
  11. Sensor not connected properly
  12. Sensor short-circuited
  13. Sensor resistance inconsistent with characteristics table
  14. Pressure sensor failure
  15. High pressure side blockage
  16. Air side heat exchanger, fan or air outlet dirt/blockage
  17. Water side heat exchanger, water piping, circulator pump or water flow switch dirt/blockage
  18. Discharge temperature exceeding 105°C indicating high compressor load or high ambient/system conditions

Where to start

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

The full answer, free

  • 39 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