Kaisai KMK-60RY1, Service Manual

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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.
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4.11 H1 Troubleshooting
Digital display output 4.11.1
Description 4.11.2

Communication error between outdoor unit main control board and inverter
module.

Split stops running.

Error code is displayed on outdoor unit main PCB and user interface.
Possible causes 4.11.3

Power supply abnormal.

Interference from a source of electromagnetic radiation.

Outdoor unit main PCB or inverter driven module damaged.
Procedure 4.11.4
H1
LED on the main control board of
outdoor unit and inverter module are
light
Yes
LED is not light, the board is
damaged,or have short circuit
No
Communicatin wires between the main
control board of outdoor unit and
inverter module is loose
Yes
Reconnect the communicatin wires
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 unit main PCB and
inverter driven module in turn
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