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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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There is an ignitor and a flame sensor. If the ignitor does not ignite the gas after a time, it goes out. If the flame sensor does not detect ignition the gas valve closes. When you start it you should see the ignitor come on like a light bulb and glow, then the gas valve opens and you get ignition. Then the flame detector turns on when the ignitor goes out. Flame detectors are like a chrome wire that has one connection to it and it sits part of the way in a burner. They get dirty and corroded. When that happens it shuts down. You can clean the flame detector with steel wool of scotch brite pads. Dont get too carried away doing that though.
The problem beleive it or not is that the bake igniter is weak ,and it is not drawing the proper amprage to open the gas valve.If you have a amp meter access the wires to the bake igniter(usually behind the storage drawer) and check for 3.3-3.6 amps when oven is set to bake by clamping the meter around ONE wire wire of igniter make sure only one wire,either one and not both. if amp draw less than 3.3-3.6 amps replace bake igniter. I know it seems improbable that if the igniter comes on that it could be the problem.Professional appliance technicians who would charge a average of $250.00 to repair your oven,have found when the igniter comes on yet the oven won't heat that a weak igniter is the cause 100% of the time
FOR THE SURFACE BURNER NOT LIGHTING
The holes on the burner espically those around where the electrode are dirty/clogged. By using a paper clip/safety pin to push in and clear the holes then clean the burner up with some steel wool the burner should light.
Yes the ignitor stays on even after the burner is lit. The ignitor is wired in series with the oven valve. It sounds like the oven valve isn't opening all the way. A new ignitor should solve this problem. The old igniter builds up resistance and doesn't let the correct voltage through to the oven valve for it to open properly.
the ignitor may be faulty and not pulling enough power to keep the as valve open in order to light them oven, even though it is getting red or glowing the power is not enough.try and replace the ignitor
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.
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