M thermal Split
66 202004
Midea M thermal Split
Procedure 4.10.4
H0
Power supply for the main control board
and transformer is abnormal
1
Yes
Provide normal power supply
No
The transformer of hydronic unit is
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
Communication wires P Q E between
main control board of outdoor unit and
hydraulic module have short circuited,
disconnected or misconnected
Yes
Reconnect the communication wires
No
Replace outdoor unit main PCB and
hydronic box main PCB in turn
Notes:
1. Measure the voltages of transformer input port and out port. The input voltage of transformer is 220V AC, output voltage of transformer is 13.5V AC. If any
voltages is abnormal, the power supply for the main control board of hydraulic module and transformer will be abnormal.
2. Measure the voltages of transformer output port ports. If the voltages are not normal, the transformer has malfunctioned.
Midea CAC
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