Kaisai 06RY1, Service Manual

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M thermal Mono
66 200208
Midea
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4.10 H0 Troubleshooting
Digital display output 4.10.1
Description 4.10.2

Communication error between refrigerant system main control chip and hydronic system main control chip.

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 4.10.3

Power supply abnormal.

Transformer malfunction.

Interference from a source of electromagnetic radiation.

Refrigerant system main PCB or hydronic system main PCB damaged.
Procedure 4.10.4
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 4.11.1
Midea CAC Confidential
Mono