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Midea Heat pump fault EC

T5_2 water tank temperature sensor error (reserved)

Heat pump

What it means

T5_2 Water tank temperature sensor error (Reserved). Occurs when T5_2 is on (User Interface- For Serviceman- Input definition- Tbt=1), while Main Control PCB cannot detect the right T5_2 sensor value.

Likely causes

  1. Sensor wiring/connection fault at CN38
  2. Water pump internal failure despite correct wiring
  3. Power supply is abnormal
  4. Power supply abnormality

Where to start

  1. Check sensor connection at CN38 on Main Control PCB
  2. Verify wiring/connection is correct
  3. Check CN28 connector for proper seating

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 111), 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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