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Midea M-Thermal Arctic HT R290 Mono fault HP

Low pressure protection in cooling mode

Heat pump

What it means

Main Control PCB detected that the suction pressure P2<0.35Mpa for 5 seconds in cooling mode and compressor running over 300 seconds.

Likely causes

  1. Refrigerant leakage
  2. Electronic expansion valve not working

Where to start

  1. Check 'Unit Status-Operation parameter-P1 comp. pressure & P2 comp. pressure' on the User Interface and check P1=P2 while the unit is off
  2. Check 'Unit Status-Operation parameter-P1 comp. pressure' on the User Interface, compare it with the reference value in Discharge/Suction pressure and temperature range in Appendix 4
  3. Reboot the unit, hold the electronic expansion valve coil to feel whether it is working, and listen for the 'Click' sound when the valve turns on/off

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 134), 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