Inlet Control Thermistor; Inlet Safety Thermostat - GE GFDS350 Technical Service Manual

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Inlet Safety Thermostat

On electric models, the inlet safety thermostat is
located on the top left area of the heater housing,
to the left of the inlet control thermistor. On gas
models, the inlet safety thermostat is located on
the right side of the diffuser, above the inlet control
thermistor. The thermostat monitors incoming air
temperature.
If the thermostat reaches a temperature beyond its
maximum temperature rating, it will trip and disable
power to the heating elements (electric models) or
burner assembly (gas models).
On electric dryers, the inlet safety thermostat opens
at 210°F (99°C) and will automatically reset at 180°F
(82°C). On gas dryers, the inlet safety thermostat
opens at 300°F (149°C) and will automatically reset
at 260°F (127°C).
To remove the inlet safety thermostat:
1. Remove the drum. (See
.)
Drum
2. Disconnect the 2 wires from the inlet safety
thermostat.
3. Remove the Phillips-head screw that attaches
the inlet safety thermostat to the heater
assembly or diffuser.
4. Lift and slide the thermostat from the heater
assembly or diffuser.
Inlet Safety
Thermostat
Electric Model Shown

Inlet Control Thermistor

On electric models, the inlet control thermistor is
located on the top left area of the heater housing,
to the right of the inlet safety thermostat. On gas
models, the inlet control thermistor is located on
the right side of the diffuser, below the inlet safety
thermostat. The thermistor monitors incoming
air temperature and will respond to temperature
changes of 3°F. The thermistor relays this
information to the control board.
The thermistor has a negative coeffi cient. As the
temperature increases, the thermistor's resistance
decreases.
Thermistor Resistance Values
Temperature
Temperature
Resistance
°C
°F
K-Ohms
10
50
202
16
60
151
21
70
120
25
77
100
32
90
74
38
100
57
49
120
37
57
135
27
66
150
19
93
200
8
121
250
3
Note: If the control reads a thermistor value too
high or too low, it will log an error code and switch
to a setting where the heaters are on a duty cycle.
The dryer then relies on the backup thermostats to
control the heater and will go into fall back mode
when it has determined that it can no longer rely on
the thermistor temperature to control the applied
heat. This occurs when a thermistor cannot sense
heat (failed open) or reads hot (failed closed). The
fall back mode consists of reducing the maximum
heating power (typically 50%) so that thermostats
are fast enough to shut down the heater in case of
overheating. On GE dryers, both heaters are cycled
on and off every minute.
Operation of the inlet control thermistor can be
checked by using service test mode T06. (See
Service
.)
Test Mode
Specifi c failures associated with the inlet control
thermistor can initiate error codes E3 and E4. (See
.)
Service Test Mode
(Continued Next Page)
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