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Midea Heat pump fault H3

T2B plate heat exchanger inlet refrigerant temperature sensor error

Heat pump

What it means

Fault relating to the T2B plate heat exchanger inlet refrigerant temperature sensor.

Likely causes

  1. Sensor fault or wiring fault at CN47 port
  2. Set temperature reached

Where to start

  1. Check sensor connection at CN47 port on the PCB
  2. Measure T1 (leaving water temperature) and compare to T1S (set temperature) plus dT1SC hysteresis
  3. Check T1Stop operating limit value

The full answer, free

  • 6 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 108), 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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