Water is not heated.
Y
Is the
electrical outlet voltage AC
187V - 253V?
Water is not heated.
Is the hot water
selection switch ON?
Y
Is the FND
water temperature indicator
flashing?
N
N
The hot water thermistor
is abnormal.
Y
If the measurement value
is outside the allowed
error range, the hot water
sensor is faulty
.
N
The hot water selection
switch is not turned on.
Turn the hot water
switch ON.
Check the hot water
sensor connector
(OPEN, SHORT).
Replace the hot water
sensor.
Is the
resistance value
of the hot water sensor in
the heater operating condition?
(17.992
KΩ or higher)
The bimetal contact is
faulty.
N
Replace the bimetal.
Y
Is the
contact of the hot
water tank bimetal short?
(Disconnect the power cord from
the electrical outlet and
check)
Y
Is the heater
resistance value rated
value (30.3~37Ω)?
If the measurement value
is off the specification, the
heater is faulty.
N
Replace the heater.
Display of thermistor abnormalities
- When the thermistor contact is faulty, the lowest cold
water temperature indicator flashes.
Sensor resistance per heater temperature
1) Heater Off temperature: 96°C resistance value ±3%
(14.817
KΩ~15.734KΩ) automatically turned off +45
seconds after reaching the value.
2) Restart temperature: 91°C resistance value ±3%
(17.452
KΩ~18.531KΩ)
Measuring the heater resistance
1) Separate the heater terminal from the PCB.
2) Measure the resistance when the surface temperature
of the heater is the same as the room temperature.
Y
Is the PCB
voltage AC 220V?
Check the PCB and
replace it if necessary.
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