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Re: Burner comes on, but doesn't stay lit
Most likely to be the falme sensor. Its attatched to the flame tunnel. Has a little window on it. First just try cleaning the window. The sensor sends signal to the coils to open and allow gas to the burner. Mat have to replace the sensor. Easy and inexpensive. Dave www.washermd.com
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Check the heating element, burner operation, ignitor, thermal fuse, and the wiring (power cord).
Visually inspect your heating element for any broken or burned areas. The heating element is a coil made from a nickel-chrome alloy, called nichrome.
When the burner is operating properly, the flame should be clean and blue.
If the ignitor is cycling without the burner lighting, you probably have defective electrical coils in the gas valve. These coils look like black cylinders with wires coming out the top of them, and are located near the burner valve assembly. When they get power, they open up and allow the gas to get through to the burner. If this is a new installation, make sure the gas valve is turned on.
If the ignitor doesn’t glow, look for a white or yellowish discoloration, or for a break in the ignitor. If this is something visible, just replace the ignitor.
if you hear the valve clicking but no gas the valve is bad.when the burner lights theres a probe that senses that it is lit and sends a microvoltage back to the controller to tell its lit.check to make sure all ground wires are grounded to a clean metal surface.
If the ignitor is working properly (glowing visibly) and the burner will not light, then I would suspect faulty gas valve coils. These electrical coils are right above the gas valves and when energized, these solenoids open the gas valves and permit gas flow to the burner. If faulty the gas valves will not open and the burner cannot light. It is recommended that if any are suspected of being faulty, that both (all) be changed at the same time and they will likely come from the parts supplier as a set. Really sorry for your trouble and I hope this helped. Best wishes.
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.
The coils are the #1 failure in gas dryers, below is a description of how they work. This excerpt from; www.repairclinic.com.
Gas valve coils
Watch 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.
it sounds like the gas valve solenoids are shorting out. there are two coils that operate in tandem to allow gas flow. these coils can eventually overheat and cause the gas not to flow as well have a rattling sound from the plunger inside the coil trying to move inside the weakened coil. the coils can be replaced and will come in a pair with guide pins to help you put them in correctly. one coil will have three wires going to it and the other coil will have two wires going to it. pretty simple fix and should solve the problem
hope this helps....jay
if ignitor not coming on could be flame sensor mounted on side of burner housing or ignitor ..if ignitor glowing but burner no lighting replace both solenoids bad connections interally on solenoids..also if ignitor not glowing possible small white thermal fuse open.. sensor and fuse can be jumped across to confirm ..
first ck gas to unit, next is ck the coils on the burner valve right, there(i just looked up and this is an older unit) set of coils is about $85, the entire burner valve including coils and new ignitor is about $135.that would be my bet the whole thing but is it worth it putting 135 into the dryer