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Here are the most common things that will need to be checked with a meter to ensure there is continuity on these parts no continuity means that the part is bad and needs replacement ok?
Thermal Fuse
If the dryer doesn't heat, but the drum
turns, check the thermal fuse(s). The thermal fuse protects the dryer
from overheating and helps to prevent fires. If the thermal fuse is
blown, it will have to be replaced.
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Gas Valve Solenoid
The gas valve has two or more electric
solenoids which open the valve to let the gas flow into the burner
assembly. If the dryer doesn't heat one or more of the solenoids may be
defective. If the igniter glows for 90 seconds but the burner flame
doesn't light, replace these coils as a set.
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Dryer Igniter
If the dryer doesn't heat, the igniter might
be burned out. Check the igniter for continuity with an ohm meter. Dryer
igniters burn out over time, similar to a light bulb.
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Heating Element
The heating element on an electric dryer can
burn out over time. If the dryer doesn't heat, the element should be
checked for continuity. The heating element cannot be repaired and must
be replaced if defective.
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Heating Element Assembly
The heating element assembly on an electric
dryer can burn out over time. If the dryer doesn't heat, the element
assembly should be checked for continuity. The heating element assembly
cannot be repaired and must be replaced if defective.
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Flame Sensor
Gas dryers have a flame sensor to detect the
heat given off by the flame. If the dryer doesn't heat, the flame sensor
might be defective. Check the flame sensor for continuity. This is not
as common as a burned out igniter or thermal fuse.
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High Limit Thermostat
Although not common, if the dryer doesn't
heat the high limit thermostat can be defective. It can be checked for
continuity. If the thermostat is "open" the dryer doesn't heat.
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Cycling Thermostat
The cycling thermostat regulates the
temperature of the air in the dryer. If the dryer doesn't heat it may be
caused by a defective cycling thermostat. This is not common.
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Main Control Board
The main control board is normally not at
fault when the dryer doesn't heat. Check all of the other components in
this troubleshooting guide before replacing the main control board. The
main control board cannot be tested easily and must be replaced if it is
defective.
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Timer
The timer is normally not at fault if the
dryer doesn't heat. In many situations where timers are replaced they
end up being returned. Check all of the more common components in this
troubleshooting guide before replacing the timer
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