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Midea M-Thermal Arctic HT R290 Mono fault HH

Repeated DC fan motor protection lockout

Heat pump

What it means

Escalation fault displayed when H6 (DC fan motor protection) occurs 10 times within 120 minutes, requiring manual intervention.

Likely causes

  1. Persistent fan motor failure, chronic power supply issue, repeated fan obstruction
  2. Repeated fan connection cable faults
  3. Repeated fan motor failure
  4. Repeated inverter PCB failure
  5. Repeated H6 fan motor protection events (10 times within 120 minutes)
  6. Persistent fan motor or power supply fault causing repeated low-speed trips

Where to start

  1. Investigate root cause of repeated H6 protection events, repair or replace fan motor
  2. Power off the unit and check if the fan connection cables are disconnected or misconnected; if yes, reconnect the cables correctly
  3. Use a digital multimeter to measure the resistance between each two of fan terminals; if the resistance is <10 Ohm, fan motor failed - replace the fan

The full answer, free

  • 5 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 28), 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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