GE GFDS350ELWW, Service Manual, Page: 92 / 111

Copyright 2011
92
Thermistor Characteristics
If the control reads a thermistor value too high
or too low then 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.
Dryer goes into this fall back mode when it
has determined that it can no longer rely on
thermistor
temperature to control applied
heat. This can occurs when a thermistor
cannot sense heat (failed open) or always
read hot (failed closed).
The fall back mode consist of reducing the maximum heating power
(typically 50%) so that thermostats are fast enough to shut down heater in
case of overheating. On these GE Model Dryers, both heaters are cycled
ON and OFF every minute.