Midea MHC-V16W/D2RN8-B - H1 Troubleshooting

M thermal Mono
202004 67
Description
 Communication error between refrigerant system main control chip and the inverter driver chip.
 M thermal Mono stops running.
 Error code H1 is displayed on refrigerant system main control board and user interface.
Possible causes
 Power supply abnormal.
 Transformer malfunction.
 Interference from a source of electromagnetic radiation.
 Refrigerant system main PCB or inverter driven module damaged.
Procedure
H1
Power supply for refrigerant system main
control board for refrigerant system and
transformer is abnormal
1
Yes
Provide normal power supply
No
The transformer has malfunctioned
2
Yes
Replace the transformer
No
There is a source of electromagnetic
radiation near the unit, such as
high-frequency transmitter or other high
strength radiation device
Yes
Remove the source of interference
No
Replace outdoor refrigerant system main
control board for refrigerant system and
inverter driven module in turn
Notes:
1. Measure the voltages of transformer input port and on the main PCB. The normal voltage between transformer input port terminals is 220V, output two
sets of voltages 11V and 17V. If one or more of the voltages are not normal, the power supply for main control board for refrigerant system and
transformer is abnormal.
2. Measure the voltages of transformer output ports. If the voltages are not normal, the transformer has malfunctioned.
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