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Midea R32 M thermal Arctic Mono fault H1

Communication error between refrigerant system main control chip and inverter driver chip

Heat pump

What it means

Communication error between refrigerant system main control chip and inverter driver chip (serial number 40). Displayed on user interface and refrigerant system main PCB.

Likely causes

  1. Communication fault between main control chip and inverter driver chip
  2. Loose communication wiring, damaged communication cable, PCB malfunction, shielding issue
  3. Communication wiring fault between main control chip and inverter driver chip
  4. Hydronic box main PCB fault
  5. Damaged cables between hydronic box main PCB and outdoor unit main PCB
  6. Outdoor unit main PCB fault
  7. Incorrect or abnormal input power supply (N or L)
  8. Wires not fully inserted into connectors

Where to start

  1. Inspect communication wiring connections, verify cable integrity, check for EMI interference, test chip communication
  2. Verify A,B,X,Y,E terminal wiring matches wire controller connection
  3. Check master/slave unit parallel wiring for correct terminal assignment (H1,H2)

The full answer, free

  • 11 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 66), 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 R32 M thermal Arctic Mono. Check the model on the data plate before you order parts.

Other Midea R32 M thermal Arctic Mono fault codes