3-5 ACCESS TO THE BLOWER WHEEL OR THERMOSTATS
To get to the blower wheel, remove the back of the dryer.
The blower wheel is under the bottom of the lint screen duct to your left, as you look at the back of the dryer.
The operating thermostats are at the blower wheel outlet.
In electric models, the hi-temperature cutout thermostat is mounted to the heat riser.
3-6 TEMPERATURE CONTROLS AND HI-TEMP SAFETIES
These clothes dryer machines use operating thermostats to control the temperature inside the drum, and hi-limit thermostats to prevent overheating of the dryer drum.. Many machines also have extra temperature controls, such as bias thermostats and heaters, hi-temperature cutoffs, and thermal fuses.
are just like regular operating thermostats, except that they are mounted inside a bias heater. When the bias heater is energized, it generates a small amount of heat, which causes the operating thermostat to open sooner, keeping the dryer drum cooler inside. Thus a bias heater
allows a single operating thermostat to act like both a hi-temp and a lo-temp operating thermostat.
A thermal fuse
is found on the blower outlet, right next to the operating thermostat(s.) This fuse will blow when too high a temperature is sensed at the outlet; usually when one of the operating thermostats has failed. If it blows, the motor may not start, or you may get no heat (no voltage to the burner.)
A thermal cut-off
is mounted on the clothes dryer heater box. It is a back-up for the hi-limit thermostat. Whenever you replace it, you should replace the hi-limit thermostat, too. A high-temperature condition causes it to open, an overheated grounded heat element may also cause it to open.