My whirlpool dryer igniter glows but doesn't stay

It may be the heating element leave door open and put a screw driver in where the door switch is and then turn on and you should see a glow where the heat comes out ; if no glow replace the element

Dryer timer

Check to see if there is a glow at the burner when you start it up. If it glows then the igniter is good. If not it could be a thermal fuse, bad igniter, flame sensor or a bad cycling thermostat. If it glows then it could be the gas valve coils.

Will try to help you checked the igniter you say good if good does it glow if so clamp on one wire and take an amp draw while heating I like to see a minimum of 3 amps if glowing and 3 and above change the coils on the gas valve very cheap, now if not glowing and good ignitor the fun begins power comes out of the heat relay on the control board passes thru the thermal fuse then thermal cut off then hi limit then the flame sensor while also feeding the gas coils the neutral is supplied thru the centrifugal switch on the tumbler motor if the dryer stays running the centrifugal switch is good and you have a neutral bad flame sensor very rare since I am not there check the thermal cut off once blown it does not reset has to be replaced if all the fused I mentioned check good then check the heat relay on the board black and red wire stick meter ends in both off should read 120 volt when machine turned on should hear it click and meter should read 0 volts the boards seldom go bad but I have replaced a few in 5 years I am leaning more towards an open thermal cutoff

Hello there and welcome to fixya there are several things that could make this dryer not heat up
Here are the most common things

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.


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.

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.

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.

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.


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.


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.


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.


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

any of these simple items could be your problem, check it out http://www.partselect.com/dryer+dryer-wont-heat+repair.htm

This happened to me. Turned out it was a gas valve fracture which had to be replaced by the gas company. That's if you have a gas dryer

If your ignitor (glow bar) is glowing that indicates the thermal fuse is okay.

With the symptoms you are describing it is acting more like an air flow issue than a component failure. Make sure your door seal is good, your venting is connected properly and try it again. I would not install the thermal fuse.

Take a volt meter and call for the unit to come on. Take the connector off to the igniter and check for voltage to those wires. If you get voltage but it does not start, then you know the igniter is bad. It could also be a limit switch. There will be 2 wires that terminate to a small disk with a button in the center. Depress the button firmly to reset it. It should be located near the burner. If it is the timer, you will need to locate and isolate the power wires leaving the timer and check voltage there. Hopefully this information is helpful.

You need to replace the thermal fuse and the timer. A bad timer will over draw a thermal fuse and cause it to blow.

Please remember to unplug the dryer before servicing