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Midea Heat pump fault HA

Tw_out plate heat exchanger outlet water temperature sensor error

Heat pump

What it means

Tw_out Plate heat exchanger outlet water temperature sensor error. Main Control PCB cannot detect the right sensor value.

Likely causes

  1. Sensor wiring/connection fault at CN10 (shared port)
  2. Water pump internal failure despite correct wiring

Where to start

  1. Check sensor connection at CN10 on Main Control PCB
  2. Refer to Part 4 Appendix: Guide for identifying inverter PCB failure to determine PCB status before component replacement
  3. Verify wiring/connection is correct

The full answer, free

  • 1 more check in order
  • How to put it right, step by step
  • The manual page for this fault (page 110), 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 Heat pump. Check the model on the data plate before you order parts.

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