The problem is either the Safety Thermostat TH2, High-Limit Thermostat
TH3, or the Heating Element itself. Here's what you should do find which
among is the culprit.
Use a putty knife blade or similar tool to push and release the clips
holding the top panel to the front panel. Insert the putty knife between
the top panel and the front panel as shown at about 2 and 3/4 inches from the
edges then push in until the clips are released then lift the top panel
Open the door then remove the two screws at the bottom of the door
opening as shown.
Remove the two screws from the upper side of the front panel
then pull the panel out and disconnect the Door Switch connector.
Once the front panel is removed, you'll see the Heater Box at the
bottom right hand side of the cabinet. Remove the cover and you'll see
three sets of the terminals on the left side of the Heater Box. The set
of three terminals is the Heating Element, the middle set is the Safety
Thermostat TH2, while last set is High-Limit Thermostat TH3.
Using a multimeter, set to the lowest Ohm scale (R X 1), check the
continuity of the Safety Thermostat TH2 and High-Limit Thermostat TH3
then the resistance between the middle terminal of the Heating Element
and the other two terminals.
The Safety Thermostat TH2 and the High-Limit Thermostat TH3 are both
normally closed and any discontinuity (open circuit) found indicates
that the component has failed. It is necessary to replace both the
Safety Thermostat TH2 and the High-Limit Thermostat TH3 if one of them
has failed. The Safety Thermostat TH2 is likely to fail as a result of
the High-Limit Thermostat TH3 failure.
The normal resistance between the middle terminal (2) and the upper
terminal (1) is 18 ohms to 22 ohms while between the middle terminal (2)
and the lower terminal (3) is 9 ohms to 11 ohms. Replace the Heating
Element if an infinite resistance (open circuit)reading is obtained in
any the measurements.
You may take the Heating Element out then thoroughly check it visually
for any obvious coil discontinuity if you don't have a the meter to
check the continuity of Safety Thermostat TH2 and the High-Limit
Thermostat TH3 and the resistance of the Heating Element. It will be
obvious if the Heating Element has a broken coil.
The problem lies in either of the Safety Thermostat TH2 or the
High-Limit Thermostat TH3 if the Heating Element coils is intact. Bypass
both the Safety Thermostat TH2 and the High-Limit Thermostat TH3 then
reconnect the Door Switch connector. Run the dryer and it should heat by
now to indicate that either the Safety Thermostat TH2 or the High-Limit
Thermostat TH3. Otherwise, it is a totally different story. Please let
us know if that is the case.
Do not use the dryer with the Safety Thermostat TH2 and the High-Limit Thermostat TH3 bypassed due to fire hazards.