Gas dryer runs for 3 mins and then no more hot air
I have a whirlpool dryer (gas) LFG7648KQ0; When I first turn it on the glow plug glows, flame ignites, hot air flows and it runs for approx 3m... The flame then goes out. Every minute afterward the glow plug goes "red" and then goes out (nothing lights)... If I let it sit and rest (cool-off) it then repeats the step's explained above... I've cleaned the lint and see that there is excellent air flow... Suggestions? thanks
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The glow coil or glow bar heats up and a sensor on the side reacts to the heat and then sends a signal to a gas valve.(solenoid valve) When the gas doesn't ignite when the coil is glowing... here are some reasons.
1. The sensor on the side of the burner assembly isn't working or sending power to the valve.
2. The valve is getting power but not opening.
3. The ignitor is not glowing hot enough to activate the flame sensor.
Usually it is the sensor or the igniter not the valve.
No you should replace the coils. Why? You know you are getting power to the gas assembly so that means the fuse and control are functioning. The igniter glows so that is good. The Flame detect is fine because it shuts down the glowbar when it heats up. So those pesky coils get hot and quit. They eventually cool back down and work a little more, very aggervating to diagnose but easy to fix.Note you do not have to remove the gas assembly to replace these coils.
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.
If your dryer heats when you first turn it on and after a few minutes it does'nt. check the ignitor to see if it is glowing. It should glow bright then you will hear a click and the burner will light. If the ignitor glows bright but you hear a click but no flame and if you watch this for several minutes and this process continues of glow then glow goes out no flame, then you have a bad burner coil. There are 2 black solenoids sitting on top of gas valve. One of them is shorting out after it warms up. Replace both solenoids. You can usually get them as a kit from parts store.
All gas dryers have a gas module. The older models (very old) have a pilot light and the new ones have what is called a GLOW PLUG and it is made out of ceramic. If this glow plug is in any way broken, you will not have any heat. The GLOW PLUG is what comes on when you first turn the dryer on and it GLOWS until the gas module actually spits out a small amount of gas and an internal combustion occurs and the flames come on full power and this is what dries your clothes. If the GLOW PLUG is fine, then the gas module could be bad. ALSO, Always check for burnt wires and check any thermostats or fuses internally in the unit.
Usually the igniter glows, the flame sensor detects the glow and sends power to the valve coils, which open the gas valve. There are some differences in that setup depending on the brand, but that is basically it.
It could be that the igniter isn't glowing hot enough (doubtful) or that the flame sensor (the rectangle thing on the side of the burner tube) isn't working (also unlikely, but still possible) or that the gas coils aren't working. Gas coils are the most common problem to go wrong on gas dryers, but when they go, they usually work at first, and then start to fail.
when you start you dryer and it got hot little bit and then won't got hot again? if yes then you may need new flame sensor..or if you can see your dryer igniter turn on your dryer and watch..you heard click sound then igniter will glow then one more click sound and should see flame..ok watch for 10 min..if after click sound igniter glow and other click flame will not apper then you need new gas valve..good luck..let me know it help or not...thanks..