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Diagnostics
8-9) When Water Valve Does Not Operate
1. While disassembling, make sure to cut off water since the water valve is directly connected with water.
2.Makesure toavoidthe electricshock while disassembling because one end of wire is applied with power.
3.Check operation of water valve only after the water switch is pressed
MAIN PCB Normal
-Check other parts
1) Wire between water value and main PCB
2) Water Value defect and Connection
Connector contact defect
3) Check Connection Hose defect
Pre-Check
Normal (check the
water valve hose)
Is valve operation
confirmation sound heard
when Water S/W pushed?
NO
YES
Soldering short
check/ PCB change
Does Main PCB MICOM #21
have high (+5V) output?
YES
NO
Soldering short
check/ PCB change
Does Main PCB MICOM #11
have low (0V) output?
YES
NO
Soldering short
check/ PCB change
Is the contact point of
main PCB RELAY RY71
normal?
YES
NO
Soldering short
check/ PCB change
Does the input voltage
occur between the main PCB CN70 ( W/BLK)
and CN71 ( GRY)
NO
YES
Load check-up method
Check Water
Valve Operation
Reference
Load check-up method
(0V upon Relay Operation)
Reference