Question about LG Dryers
Gas Dryer no heat: or shuts down soon after heating CHECK:
If the air flow in the dryer is restricted, the temperature in the heating chamber can get hot enough to blow the thermal fuse. If the fuse blows, it cuts power to the coils that control the gas valve. The fuse is usually mounted to the exhaust duct just inside the back panel. You can check its continuity with an ohmmeter. If, after disconnecting the fuse, you get any reading other than 0 when you touch the leads of the meter to its terminals, it has blown. There's no way to restore it -- you'll have to install a replacement.
Igniter and Gas Valve Coils
TEST with a multi meter: The igniter is an electric conductor that works like the element in an electric heater, glowing hot enough to ignite gas when you turn on the dryer. This conductor can burn out, and when it does, it may glow, but it won't get hot enough to ignite the gas. At times it may give a reading of continuity yet fail mechanically and not get hot enough to ignite flame though it gets hot and glows and even may show Ohms or continuity ( close circuit) ?
Occasionally, the Gas safety valve and the electric coils that control the gas valve are defective -- they can wear out when the dryer gets old. When this happens, the igniter glows, but gas never enters the heating chamber or does not stay consistant.
Performing a continuity test on either part will help you determine whether or not you need to replace it. But the coils should also be tested for amount of resistance as well as Ohms. As they may be showing ohms yet not putting out enough resistance to keep proper gas pressure flowing. Most coils should show at least 1300 ohms ( GIVE OR TAKE 150 OHMS). Anything significantly less Thus u get an ignition but then it soon goes back out. The flame does not stay lit.
Air Flow and Heat
The motor that drives the tumbler also drives a fan that circulates air through the heating chamber and the tumbler and expels it through the vent. If the air can't circulate, perhaps because of lint blockage, the heating chamber overheats, which prompts the cycling thermostat to turn off the gas. The thermostat resets when the chamber cools, but the chamber heats up quickly and the thermostat again shuts off the gas. The result is that the temperature in the tumbler doesn't stay hot, and your clothes take longer to dry, if they get dry at all.
There's a big difference between a dryer that doesn't heat up at all and one that just doesn't get hot enough to dry your clothes. In the first instance, the problem is usually a defective part, and things should be back to normal after you replace it. In the second instance, the problem is caused by restricted air flow, and you need to clear the lint filter and vents and take steps to prevent lint build-up. If you don't, you'll use more energy for drying than you need and the dryer may continue to malfunction. Worse, you may have a dryer fire.
Posted on Apr 03, 2015
I would check the vent and be sure it is open and free of lint. That would be the easiest thing to check. If you have the flexible white duct replace it, it is a lint trap.
Posted on Apr 03, 2015
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Posted on Jan 02, 2017
In light of everything you checked, it sounds like you have a bad set of coils on the gas valve. When they go bad, it can take a long time between cycles. Hope this helps!
Posted on Dec 08, 2009
Testimonial: "thanks-the hunt continues"
Hello Friend, Your solution is simple. It sounds like your dryer is working properly, and your actual problem is a blockage somewhere in your 4 inch exhaust tubing. Check it and make sure it is not clogged up with excessive lint. Also if your tubing is clear you need to check your connection where it travels thru the wall etc. It would be a good idea to find the actual location where it exits to the ouside and check for good airflow. Your dryer is equiped with a safety thermistat and if you are not getting the proper exhaust flow the burner will cut off and restart in the manner that your's is doing. I Hope I have helped you, Tim. And please don't forget to give me your rating for my help.
Posted on Jul 11, 2009
SOURCE: Intermitten Heat up
I would like to thank the ones who responded to giving me a 'hand' in repairing my dryer. I did like you said & changed out the coils & now the dryer is working like it should.
Posted on Apr 12, 2008
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