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Midea M-Thermal Arctic HT R290 Mono fault E4

T5 water tank temperature sensor error

Heat pump

What it means

T5 Water tank temperature sensor error. Occurs when DHW mode is on (User Interface- For Serviceman - DHW setting- DHW mode=1), while Main Control PCB cannot detect the right T5 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 CN13
  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 CN13 on Main Control PCB

The full answer, free

  • 3 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.

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