TradeAssistIQHome

Midea M-Thermal Arctic HT R290 Mono fault F75

Protection for insufficient discharge overheating degree

Heat pump

What it means

Protection triggered when the difference between discharge temperature (Tp) and condensing temperature (Tc) is less than 0°C and persists for 10 minutes, indicating insufficient discharge superheat.

Likely causes

  1. Excess refrigerant charged in the unit
  2. Electronic expansion valve malfunction (stuck or not operating)

Where to start

  1. Check 'Unit Status-Operation parameter-P1 comp. pressure & P2 comp. pressure' on the User Interface
  2. Compare pressure values with reference values in Discharge/Suction pressure and temperature range in Appendix 4
  3. Pull out Tp temperature sensor from compressor fixed sleeve, leave in air for 10 mins, and check if temperature difference between sensor and air is greater than 5℃

The full answer, free

  • 2 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 143), right under the answer
Ask about F75 freeCreate a free account

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