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Re: the dryer ignites but the gas valve does'nt light
Check that the gas sensor is clear or any lint/dust/crud, etc. as that could be preventing the gas valve from opening up and allowing ignition. Typically all gas dryers have a safety feature that won't allow operation if the exhaust vent pipe has excessive lint and dust in it, as that is a fire hazard.
Look in your owner's manual to see the procedures for accessing the vent exhaust and follow your specific instructions. Usally there is an access panel/door at the bottom front of the dryer that will allow you to get inside the vent, etc. Inside that is a surface mounted sensor that does a couple of things; checks for proper air (venting) flow; no excessive dust/lint buildup; and that the ignitor coil has been "lit", etc.
If any of these doesn't occur, the gas valve will not open. Follow the monthly cleaning procedure/check to make certain that the dryer is safe to use and operate.
If all the above are OK, then it is likely that the sensor has failed and needs to be replaced. You can look at the searspartsdirect.com to find your particular model using their parts diagrams and illustrations of your dryer, etc.
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If your gas dryer is not working because it is not heating then you need to check this out. Today’s gas dryers often do not use the simplethermocouple with a pilot to prove the flame anymore. They use a much more complicated method of lighting the burner and proving the flame.
The use of electric igniters has become the standard for many dryers today. The thermostat calls for heat, power is supplied to the igniter, then after a certain amperage draw on the igniter, the gas valve is energizes to open and allow gas to flow starting the flame. As long as the amperage draw on the igniter is high enough then the gas valve stays open till the thermostatis satisfied.
Sometimes the igniter will crack and no current will go through and the igniter will not even heat up or glow. Sometimes the igniter will wear to the point where it will still heat up and glow, but the current draw will not be high enough to allow the gas valve to open. This creates a confusing situation where you look into the dryer and see the glow from the igniter, but get no heat because the burner never lights up. If this is the case then you will need to replace the igniter even though it seems to be okay. The only way to know for sure is to know what the current draw requirements are for that gas valve and to have an amp meter to check the current draw.
Most of the time the problem will be in the igniter, and not the gas valve. Gas valves can go bad, but that is the case in only a very small amount of the situations. It is a pretty safe bet that if you have a problem with you gas dryer lighting that you have a problem with your igniter.
If your dryer doesn't heat, check these:
Gas valve coils
IgniterModern gas dryers use an electric igniter to ignite the gas from the gas valve. When it's working properly, the igniter glows bright orange. When it burns out, the dryer tumbles but there's no heat because the gas can't ignite. When the igniter burns out, you need to replace it. If the igniter is held by a tension bracket, you very well may need to replace the bracket too. The igniter is inside the dryer housing, near the bottom front, usually in a cone-shaped metal tube (the force cone). It's about 2 inches long. It's mounted to the far end of the burner tube, and it has two wires attached to it--or to the tension bracket, if there is one.Gas valve coilsWatch the igniter. Does it glow bright orange, then shut off without igniting the gas? (When the gas ignites there's a large blue flame.) If so, there may be defective coils on the gas valve. Mounted on the top of modern gas valves, there are black electrical coils. The coils, when energized, open the gas valve. If one or more of the coils are defective, the valve doesn't open and the gas cannot ignite. Because it's often difficult to properly test the coils, it's usually best to replace both (all) of them at the same time. Thermal fuseOn many dryers, there's a thermal fuse (a heat-sensitive fuse that blows if the dryer overheats) mounted to the exhaust duct inside the back cover panel. The fuse is about an inch long. It's usually embedded in black resin and mounted in a white plastic housing. If the fuse has blown, it has no continuity. When this happens, your dryer either just stops heating, or it doesn't work at all. Be sure to inspect the venting/heating system before replacing the fuse to put the dryer back into operation. (You can't re-set this type of fuse.
All modern gas dryers use a hot surface igniton system(very old dryers had pilots). There could be a problem with the igniter,gas valve, ect. If you remove the bottom cover panel or inspection cap you can check to see if the hot surface igniter starts to glow when dryer is intially started. Just because the igniter does not glow does not mean that the igniter is the problem. There are two gas valves that work in conjunction with the ignition system as a safety(one could be defective). Also make sure that the gas connector at the back of the dryer is not restricted(kinked) and the gas line valve did not get shut off some how.
I would take a look at the gas coil solenoids. The gas coils are right above the gas valves. They are black electrical coils. When energized, the coils open the gas valves. If one or more of the coils is defective (bad solenoids), then the gas valves won't open and the gas cannot ignite. Because it's difficult to test the coils, it is best to replace both (all) of them at the same time. Sure hope this helped and best wishes.
The burner assembly consists of the gas valve, the igniter and sensor, and the thermostats. The gas supplied to the appliance is turned on and off by the gas valve, as follows:
First--when you close the dryer door, set the timer, and press or turn the Start button--the motor starts. When it reaches full speed (in about a second) a switch on the motor turns on, which allows the electricity to flow through a simple thermostat to one side of the gas valve.
The gas valve then sends power to the igniter, which glows bright orange.
As heat and light from the igniter warm up a sensor that's right next to the igniter, the sensor circuit opens, then supplies power to the other side of the gas valve. This completes the circuit and opens the valve.
Once the valve opens, the gas rushes out and the igniter ignites it. As the gas burns, it keeps the sensor warm, which keeps the gas flowing.
When the dryer reaches the pre-set drying temperature, a simple thermostat turns off the flow of electricity to the gas valve and therefore turns off the gas.
When the temperature in the dryer falls about 20 to 30 degrees, the thermostat again allows the electricity to flow through to the gas valve, and the cycle starts over.
If you selected the Automatic setting, the cycle continues until the clothes are dry, then the timer advances and turns the dryer off.
If you selected a timed setting, the cycle continues until the time has expired, then the timer turns off the dryer
Igniter glows, then shuts off without igniting gas - the problem is probably with defective coils (black, located on top of the gas valve). It is recommended to replace all coils (usually two or three) if found defective.
Note: Sometimes the whole gas valve may be defective, thus not letting the gas out. However, this problem is not common.
Gas valve coils
Igniter glows, then shuts off without igniting gas - the problem is
probably with defective coils (black, located on top of the gas
valve). It is recommended to replace all coils (usually two or
three) if found defective.
Note: Sometimes the whole gas valve may be defective, thus not
letting the gas out. However, this problem is not common.
could be dirty heater you have to clean the runners and the smole nozzles that are in the manifold below the gas valve it's like a 9/16 size you pull them off and check make sure they are clear through, sometimes little spiderwebs build up inside them. if it's all clean, then it could be you flame rectifier/ aka: flame sensing rod, that tells the htr that there is fire so it keeps running. Let me know what happened.