TROUBLESHOOTING
68
H0
Description
• Communication error between the main PCB and the hydronic system PCB.
• The unit shuts down.
• The error code is displayed on the hydronic system PCB, refrigerant circuit PCB and user interface.
Possible causes
Abnormal power supply.
Transformer malfunction.
Interference from a source of electromagnetic radiation.
Main PCB or hydronic system PCB damaged.
Procedure
H0
↓
Power supply for PCB and
transformer(s) is abnormal (1)
YES →
Provide normal power supply
NO
↓
Transformer malfunction (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 X Y E between the unit’s
main control board and the hydraulic module have
short-circuited, disconnected or are misconnected
YES →
Reconnect the communication wires
NO
↓
Replace the main PCB or refrigerant circuit board
1 Measure the voltages of transformer input port and on main PCB. The normal transformer voltage for units
WiSAN-YME 1 S 2.1-8.1T is 220V input and 18V output. The normal transformer voltage for units WiSAN-YME 1
S 9.1-14.1 is 220V input and 13.5V output. If one or more of the voltages is not normal, the power supply of the
refrigerating system’s main control board and transformer is abnormal.
2 Measure the voltages of transformer output ports. If the voltages are not normal, the transformer has failed.
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