Sensor Rods; Thermostat, Hi-Limit (Electric Models) - GE Profile DPSB650 Technical Service Manual

Hi-Limit Thermostat (Electric Models)
An L315-65F hi-limit thermostat is located on the left
side of the heater assembly (electric models only).
The hi-limit thermostat is wired in series with the L1
side of the motor relay. The thermostat will open if
an excessive temperature of 315 °F is attained,
disabling all dryer functions. The hi-limit thermostat
will close when its temperature has cooled
to 250 °F.
To remove the thermostat:
1. Remove the top panel, the front panel, and the
drum. (See Top Panel, Front Panel, and Drum.)
2. Disconnect the lead wires to the hi-limit
thermostat.
3. Remove 1 screw and the thermostat.
Sensor Rod Circuit
The moisture-sensing rods are part of a circuit that
is designed to utilize a low-voltage capacitor that
charges to 5 VDC when the circuit is open and
discharges to 1 VDC when the circuit is shorted. A
space between the 2 rods causes an open in the
sensor rod circuit. When wet clothes touch the two
rods, they create a short, which discharges the
capacitor. When the clothes become dry, they
cannot short the circuit; and the charge across the
capacitor builds to 5 VDC. If the electronic control
board reads 1 VDC across the capacitor, it is
determined that the clothes are wet. As the clothes
are dried, the voltage across the capacitor
increases. When the electronic control board reads
5 VDC across the capacitor, it is determined that the clothes are completely dry. The capacitor for the
sensor rod circuit is in the wire harness near the sensor rods and can be replaced as a separate
component.
Note:
• Proper leveling of the dryer is vital for accurate sensor drying. Excessive rearward adjustment will
cause clothes to tumble toward the rear of the drum, preventing contact with the senor rods, thus
producing a false dryness reading.
• During sensor drying, if the sensor rods are not shorted within the first 6 minutes of the cycle, the
unit will determine that the drum is empty and terminate the drying cycle.
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 = 10%
Dry = 2-6%
More dry = <2%
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Hi-Limit Thermostat
Hi-Limit Thermostat
Sensor
Sensor
Rods
Rods