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Won't dry The gas dryer fires up with heat initially but cools down and won't reheat again. I suspect a bad thermostatic switch.

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You are correct. Though some dryers have bimetallic thermal switches and other types most are thermocouples or RTDs which provide the temp sensing voltage or current to the feedback control system microprocessor. It has either gone bad, has a loose connection or a mild short (which causes a coupling in that area not the heat), or the microprocessor is "glitching". If you find the leads for the thermocouple coming from the processor, most likely "K" type chromel-alumel, they are red and yellow, and there should be continuity. If it is an RTD , resistive temperature device, a standard platinum 385 should be 100 Ohms. Check that RTD or the thermocouple (the welded splice of the red and yellow wires) has not come away from it's intended location. If it is a mechanical temp switching device it will be physically broken and obvious when you see it.

Posted on Sep 10, 2009

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  • Dryers Master
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Intermittant coils. Seen it. Some repair PIX

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

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Samsung gas dryer heats up and then stops. No lint in dryer trap or hose. What could it be? Heating Element? Reset button? Please help! !


The key to your issue is the gas dryer. you need to know how it works to be able to diagnose it. A gas dryer will only fire up if the thermostat calls for heat and the hi limit thermostat is not tripped and the gas valves open and the igniter fires. Any of these not working will not lt dryer fire up the heat.
lets assume the running thermostat is ok since it fires up initially and they seldom are intermittent. A restricted vent would trip the high limit t-stat quickly and would not fire up again till it cools down and resets, since you have stated that the vent is clear and unrestricted we will again assume the hi limit stat is not the problem
(it still could be if it was faulty and opened up prematurely, but again that is not one of the more frequent issues). The flame detector needs to be satisfied to continue the burn after flame is ignited. The detector is a simple device that is located on the burner plenum and is a bi-metal with a clear window that lets light (flame) through to a bi-metal switch that will interrupt gas supply in case there is no flame. these again are not on the most frequent list of parts going bad.
The most likely cause of this problem is a bad igniter. they glow orange on start up and ignite the gas. even though they glow orange does not mean they are good, most develop cracks in the ceramic material and are very brittle. If a crack is present you seldom can see it and often will look normal in operation, but once heated the second cycle of heat fails to ignite. This can be measured cold by resistance check compared with standard value. I often just change them on a hunch , saves time and part cost is not high. Labor time is often higher checking it's value. Another possibility is an intermittent gas valve and that is harder to diagnose and it is an expensive part. Seldom is the valve intermittent though.
This should give you a good start, good luck

Jun 27, 2014 | Dryers

1 Answer

The dryer works fine in TimeDry mode, but in Intellidry mode it dries very slowly. The "Moisture Moniture" indicator lights start and stay at "Less Dry". I have replaced the moisture...


you could have bad gas coils.if the timer doesn't advance in auto dry most likely you're having heat problems,when the dryer heats and then the heat shuts off then the timer will advance,when the heat comes back on the timer stops,it does this until the clothes are dry.gas coils when starting to fail will work normally until they get hot and then no heat until the coils cool down then they will work again,on time dry the timer just keeps counting down until the time runs out no matter what's happening to the dryer.i've seen the coils fail after the first 10 minutes and other times for 20 to 30 minutes but usually if the load is big and in time dry the clothes will feel warm and you'll need to dry them a second time to get them fully dry,also while you're in ther you should clean out the dryer at least once a year,clean out the duct that the lint filter slides into,vacuum out the cabinet where the motor is and blow out the vent line,if it's a long run i use a leaf blower to blow out the line,remove it from the back of the dryer,stick the leaf blower into the vent line and blow it out,i've blown out birds nest out of some lines, your clothes will dry on time,you won't go through so many parts and you won't have to worry about a dryer fire,the gas coils are on top of the gas valve,remove the two phillips screws,lift off the cover and change out the coils.next time you use the dryer keep an eye on it,after it runs for 20 minutws start checking it,you'll hear a click,then another click and the flame will lite,look into the gas tube and if the flame isn't liting then you have bad gas coils.

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1 Answer

My Hotpoint gas dryer won't relight after it has


Your gas valve electrical coils have gone bad. They are easy to replace.

Jun 21, 2011 | Hotpoint Dryers

1 Answer

Dryer starts to dry comes up to temp then goes out and will not reheat but you can see ignitor come on but gas will not come on then some times you can smell gas out the vent and its cool what gives


Hi, If you are having problems with your gas dryer not heatingthe most common problem is that the ignitor goes bad. Even though it glowssometimes 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 differentthings that can go wrong causing the dryer not to heat. check out this electric no heat tip...

heatman101

Nov 24, 2010 | Whirlpool Dryers

2 Answers

Gas Dryer only runs burner once after starting, why


Lets see, you have power to the gas assembly so the fuse is good and the ignitor will fire up. But she won't fire off again. The flame sensor is working because the ignitor is coming on and off. That means the control thermostat is working so everything is working. So what's the problem. Simple.933a1bb.jpg The solenoid coils heat up and quit on these machines with a little age. Very difficult to diagnose unless you know the trick.
Cheap parts link, your part sir: AP3094251,

May 14, 2010 | Maytag MDG2706A Gas Dryer

1 Answer

Shuts off before clothes are dry, will restart and shut off again


Most likely, the operating thermostat has failed. When the dryer heats up, it gets too hot and the high limit thermostat turns the machine off. After it cools down, it will start again.

Unplug the machine! Check the thermostats for continuity with a multimeter. All thermostats should have continuity at room temperature.

Apr 27, 2010 | Kenmore 73952 Gas Dryer

2 Answers

Dryer (electric) seems to heat up initially, then cool off and not get hot enough to dry clothes. What is wrong?


Check the following areas thoroughly to address this issue.


1. Venting
Make sure the dryer vent hose, as well as the rest of the vent duct, is not clogged.

Unless regular maintenance is performed, chances are there is a lot of lint accumulated inside the dryer. This might affect the drying time and could be a fire hazard. Make sure to have your dryer cleaned regularly. Because this might involve taking most of the dryer apart, it is recommended to have a qualified appliance repairman perform this task.

2. Thermostat
There are a couple of cycling thermostats inside the dryer. If one of them breaks down, it might affect the dryer's performance. Replace the defective thermostat.(usually located inside the unit on the actual blower housing or inside the vent duct)

3. Heating element
A heating element might only be partially burned out, in which case it would still work but will take longer time to dry the clothes. Replace the element if found defective.

Aug 19, 2009 | Dryers

1 Answer

Maytag Neptune gas dryer MDG4000AWW not heating properly.


Note: Normal drying time for a dryer is about 45 minutes (some may take up to an hour).

1. Venting
Make sure the dryer vent hose, as well as the rest of the vent duct, is not clogged.

Unless regular maintenance is performed, chances are there is a lot of lint accumulated inside the dryer. This might affect the drying time and could be a fire hazard. Make sure to have your dryer cleaned regularly. Because this might involve taking most of the dryer apart, it is recommended to have a qualified appliance repairman perform this task.

2. Thermostat
There are a couple of cycling thermostats inside the dryer. If one of them breaks down, it might affect the dryer's performance. Replace the defective thermostat.

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1 Answer

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suspect coils bad on burner valve after heating up first time will sometimes fail on following fire ups

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1 Answer

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most likely solenoids after a few firings they tend to open up and not work again until after cool down replace both they usually come in a kit

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