Automatic Temperature Control (Atc) - GE WCRE6270K Technical Service Manual

Water Valve
The water valve is a 120 VAC, dual solenoid type,
and is accessed by placing the control panel in
the service position. It is inserted and retained in
a cutout in the rear of the backguard and held in
place by 2 hex-head screws. It is only available as a
complete assembly.
• The water valve has a fl ow rate of 2.8 gallons
per minute on the cold side and 1.8 gallons hot
side.
• If the pressure switch is not satisfi ed within 20
minutes, a fi ll error code will be recorded. If the
pressure switch has not opened in 45 minutes,
the main control will de-energize the water valve
and place the washer in pause mode.
• Each solenoid coil has an approximate
resistance value of 1.1K Ω.
To remove the water valve:
1. Disconnect power.
2. Place the control panel in the service position.
(See .)
Control Panel
3. Remove the fi ll hoses from the water valve.
4. Disconnect the white wire harness from the hot
water (H) solenoid valve.
5. Disconnect the red wire harnesses from the cold
water (C) solenoid valve.
Note: The fi ll funnel hose is diffi cult to remove.
6. Remove the fi ll funnel hose. Squeeze the clamp
and slide it back. Carefully break the hose loose
by inserting a small fl at-blade screwdriver under
the hose to break the seal.
7. Remove the two 1/4-in. hex-head screws that
hold the valve to the cabinet.
Disconnect

Automatic Temperature Control (ATC)

• The automatic temperature control (ATC) is a feature
that utilizes a thermistor to regulate the water fi ll
temperature.
• The thermistor has a negative temperature
coeffi cient (as temperature increases, resistance
decreases).
• The thermistor is located in the outlet of the fi ll
funnel and will measure 50K Ω at room temperature
(77°F / 25°C).
• If the thermistor reads outside the expected range
(10K - 120K Ω ), the main control will default to the
following pre-programmed fi ll temperature settings:
• When both valves are energized, the internal orifi ces
in the valves meter the fl ow to a 60% cold and 40%
hot ratio.
• With the lid open, ATC will remain activated. The
temperature of the water entering the washer
with the lid open may vary greatly from customer
expectations due to the cycling of the fi ll valve
solenoids.
• Extreme water temperatures at low pressure can
cause the ATC to use it's maximum number of
activations and revert to a preset fi ll routine. The
main control will not allow the water valve to cycle
more than 25 times per fi ll.
Resistance can be measured at the wire harness
located on the control board location J5. Make sure to
unplug the connector to isolate the thermistor before
taking resistance readings.
Fill Funnel Hose
To determine the temperature of the incoming
Clamp
water, the main control measures the difference
between the voltage sent and the voltage returned
from the thermistor. The main control then makes
temperature adjustments accordingly.
– 19 –
Tap Cold = cold water valve only
Cold = cold water valve only
Cool = hot and cold water valves
Colors = hot and cold water valves
Warm = hot and cold water valves
Hot = hot water valve only
1 2 3 4 5
J5 J5
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