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There are 3 things that will make a gas dryer not ignite. 1. the main controller 2. high limit thermostat, which disconnects power to the igniter if the dryer overheats 3. the electronic or electric igniter. There are 2 types of igniters static that sounds like a ticking noise before it lights and a thermal that glows red hot to ignite the burner. Most dryers will attempt to ignite 3 times and will shut down if the burner does Not ignite to keep unburned gasses from being expelled.
With the front cover off also called the kick pan, look at the burner assembly and you will either see the spark igniter (like a giant spark plug) or the thermal igniter glow red hot. If the igniter does not activate, and the drum is turning, it is either the igniter, or the high limit thermostat stuck in the open position and needs to be replaced.
Both can be purchased from EBAY and will save you lots of money.
If the coils are bad the unit will light with flame for 4 - 8 times then all of a sudden the ignitor will glow, kick off with no gas coming threw valve. it sounds like the high limit thermostat is short cycling the flame. This is the thermostat that sits on top of the burner chamber. remove 1 screw from the thermostat and blend it upwards away from the heat. Then plug unit back in and test to see if the flame stays on longer. Click here to see maytag dryer no heat posts. Contact me anytime here. Hope this helps..
it could be the thermal fuse on the dryer vent housing open,the radiant sensor or high limit thermostat on the burner tube housing,the ignitor on the burner that glows to ignite the gas,or the boost and secondary gas valve coils on the gas valve that open the gas valve to supply gas to the burner,all items need to be accessed thru the removal of the front cover and checked with an ohmmeter for continuity or resistance
check the thermal fuse in the dryer vent duct to be open,then if not the flame eye" radiant sensor" or the high-limit thermostat both on the burner tube if the sensor doesn't see(sense) a flame the gas valve will stay shut,then check the gas valve coils,both the BOOST and SECONDARY coil valves on the gas valve body as these can open up and not gas into the burner
it could be your radiant flame sensor on the burner tube that senses the flame,or it could be bad boost and secondary gas valve coils on the gas valve located inside the unit,a defective high-limit or cycling thermostat on the burner tube,any one or combination of these can cause your symptoms
Could be a couple different things,Possibly a thermostat or high limit that is kicking out too soon,also has a flame sensor next to the burner that can come and go.if you have a toggle switch or pushbutton switch you can unplug the unit take the two wires off the flame sensor (black box about the size of a cigarette pack on the left of the burner)plug them into the switch start the dryer Turn the switch on till the igniter glows bright,turn the switch off and the burner will light if it stays lit at least till it gets to temp replace the flame sensor.(It won't cycle with out flipping the switch each time)
since burner is igniting, it probably is OK. next check is limit switch. this switch shuts the gas off if it senses excessive heat (blocked vent ... usually caused by lint) limit switches themselves MAY go bad ... bu rarely
PS check to make sure the vent is blowing exhaust to outside of house (i've seen birdnests in the exhaust port cause your problem)