Midea MHC-V6W/D2N8-B User Manual

M thermal Mono
66 200204
Midea M thermal Mono Service Manual
4.10 H0 Troubleshooting
Digital display output
Description
 Communication error between refrigerant system main control chip and hydronic system main control chip.
 M thermal Mono stops running.
 Error code is displayed on hydronic system main PCB, refrigerant system main control board for refrigerant system and
user interface.
Possible causes
 Power supply abnormal.
 Transformer malfunction.
 Interference from a source of electromagnetic radiation.
 Refrigerant system main PCB or hydronic system main PCB damaged.
Procedure
H0
Power supply for main PCBs and
transformer(s) is abnormal
1
Yes
Provide normal power supply
No
A 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
hydronic system main PCB in turn
Notes:
1. Measure the voltages of transformer(s) input port and on the main PCB. The normal voltage between transformer input port terminals is 220V, between
GND and 18V is 18V. 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(s) output ports. If the voltages are not normal, the transformer has malfunctioned.
4.11 H1 Troubleshooting
Digital display output
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Midea MHC-V6W/D2N8-B Specifications

General

Brand	Midea
Model	MHC-V6W/D2N8-B
Category	Air Conditioner
Language	English