Fault diagnosis
Coway co., Ltd
5-1
5. Fault diagnosis
5-1 Checking faults by symptoms
5-1-1 Fault diagnosis
Power supply defect
Y
No lights
on the operation part and
indication part.
If the power is 85V
or lower, it is a power
supply defect.
Is the power
supply voltage normal?
N
Power supply defect
Y
Is the main
PCB input voltage AC
220V?
N
Is the
connection between
the power cord and the wiring
connector normal?
Check the household power
supply.
The power supply is
irregular or 0V.
Check the distribution
contacts of the electrical
outlet and check whether
the power supply is cut of
f.
Y
Is the main
PCB fuse blown off?
N
Is the
connection of the main
PCB connector normal?
Power connector
connection is faulty.
N
Fit the connector correctly.
The fuse is blown off.
Y
Check the main PCB fuse
and replace it if necessary.
Main PCB connector
connection is faulty.
N
Check the main PCB and
replace it if necessary.
Y
Y
Is the FND
connection cable open?
FND cable connection
is faulty.
Y
Check the FND cable and
replace it if necessary.
N
Is the
voltage of the PCB micom
DC 5V?
PCB power circuit
defect.
N
Check the main PCB and
replace it if necessary.
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