Door Switch; Moisture Sensor - GE GFDS350 Technical Service Manual

Door Switch

The door switch is fastened to the front panel by 2
locking tabs (1 on each side). When the dryer door
is closed, the switch will complete the drum motor
circuit, allowing dryer operation. When the door is
open, the switch will open the drum motor circuit,
interrupting dryer operation. Opening the dryer door
will also cause the door switch to close the drum
light circuit, allowing the drum light to be energized.
Locking Tabs
Door Switch Front View
Door Switch
Door Switch Rear View

Moisture Sensor

The moisture-sensing circuit consists of 2 sensor
rods. They are mounted beneath the lint fi lter on the
drum side of the air duct.
Note: The 2 sensor rods in the air duct assembly are
replaceable individually. To replace the sensor rods,
order part WE1M575.
• The sensor rods are connected to the
main control board. The rods are spaced
approximately 1/2-in. apart, which creates an
open circuit to the control.
• The control board utilizes a low-voltage
capacitor that charges to approximately 5 VDC
when the circuit is open and discharges to less
than 1 VDC when the circuit is shorted.
• When wet clothes tumble across the two
rods, the clothes create a very low resistance
between the rods, which discharges the
capacitor.
• As the clothes become dry, their resistance
value increases and the charge across the
capacitor builds to approximately 5 VDC.
• Proper leveling of the dryer is vital for accurate
sensor drying. If the front of the dryer is raised
too high, clothes will tumble toward the rear of
the drum, preventing contact with the sensor
rods. This could produce a false dryness reading.
The dryer will signal when the clothes are at 17%
moisture level if equipped with a damp signal that
has been selected.
Approximate values for dryness level:
Damp = 17%
Less dry = 12%
Dry = 2-6%
More dry = <2%
Operation of the moisture sensor can be checked by
using service test mode T07. (See
– 31 –
.)
Service Test Mode