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Midea M-Thermal Arctic HT R290 Mono 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. Temperature sensor connection on Main Control PCB is loose, misconnected, broken or moisturized
  2. Main Control PCB fault
  3. Sensor wiring/connection fault at CN38
  4. Main Control PCB failure

Where to start

  1. If Yes, check if temperature sensor connection on Main Control PCB is loose, misconnected, broken or moisturized; if Yes, reconnect the temperature sensor correctly and keep it dry
  2. If No to all above, replace Main Control PCB
  3. Check sensor connection at CN38 on Main Control PCB

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 M-Thermal Arctic HT R290 Mono. Check the model on the data plate before you order parts.

Other Midea M-Thermal Arctic HT R290 Mono fault codes