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Dryers usually have interlocks to keep things from overheating or, worse, catching on fire. You may be able to narrow it down a bit by seeing if it matters whether there are any clothes in the dryer. Most likely, the dryer thinks it's overheating, or in danger of doing so. Couple of possibilities. For anything involving disassembly or hands into any part of the dryer but the clothes tumbler, make sure you unplug the dryer and turn off the gas. No short cuts there, you can kill yourself.
Exhaust vent is clogged, no exit for hot damp air, too much back pressure on fan. Undo hose clamp in back. Clean lint from hose, reachable area in back of dryer, and in wall. Check outside as well, if the vent goes under your house or anywhere but right through the wall. Make sure the outside vent isn't blocked, jammed, or clogged. Some folks religiously clean their lint screen, but let the vent accumulate stuff for years.
Air inlet is clogged. Laundry looms accumulate lint. Sometimes that can end up drawn back into the air inlets. Make sure vent through-holes in back are clean and unblocked.
If you unscrew the back panel, look at the air inlet to the burner area (careful if it was just on) and clear lint.
The output blower motor can get clogged with lint and not actually move air anymore. You may have to do a bit more disassembly - probably a few more 1/4" hex head screws to open the fan assembly that feeds to the outlet duct. You may see a ton of lint built up between the blades. Remove it with fingers, vacuum cleaner, canned air, or the like. That will also likely help a bit.
There are actual sensors. You'll need to look at a DIY list for how to check them with a voltmeter, but they'll fail from time to time and trip an interlock - most dryers, for safety, are built to assume the worst if one of the sensors fails, to make sure a sensor failure doesn't lead to destroyed clothes or fires.
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Hi,
If you are having problems with your gas dryer not heating
the most common problem is that the ignitor goes bad. Even though it glows
sometimes it is still not working properly.
if you dryer is gas check out this gas no heat tip....
If you have an electric dryer, you can have many different
things that can go wrong causing the dryer not to heat.
Watch the burner assembly, shortly after starting the
dryer the ignitor should begin to glow. If it glows for several
seconds (up to 15 seconds) and then goes out, then the problem
is probably the solenoids (coils). If the ignitor glows and stays
on, then the problem is usually the flame sensor.
Is this the scenario? It lights for a few cycles or maybe not at all. The ignitor glows and goes out but no flame. Comes back on then does the same thing. If so it could be failing coils (those two black cylinders on top of the gas valve assembly). There's a kit that includes both and it's a fairly simple job.
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