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Midea M-Thermal Arctic HT R290 Mono fault H2

T2 plate heat exchanger outlet refrigerant temperature sensor error

Heat pump

What it means

Fault relating to the T2 plate heat exchanger outlet refrigerant temperature sensor.

Likely causes

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

Where to start

  1. Identify CN30 terminal block pins 1-10 (A, B, X/HA, Y/HB, E, T1, T2, E1, H1, H2)
  2. Confirm correct wiring of A, B, X/HA, Y/HB, E to external Modbus module terminals X1/HB, X2/HA, H1, H2
  3. Verify B-/A+/E connections to Modbus interface

The full answer, free

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

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