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Originally Posted by: tejardine  I have the same problem everything works ignitor glows hot no gas if I just put the two leads together off the flame sensor and by pass the switch with same result I know that semnsor is good. Correct? This is a duplicated post. Answered here: http://forum.appliancepartspros...137679-double-check.htmlGene.
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Originally Posted by: Joe / APP Team Lester, Scolmery,
Lester is almost on the money.
The radiant sensor(flame switch, flame sensor) is a basic switch, has an open or closed circuit. and usually works or doesn't work 99% of the time.
I think, I may have replaced one or two for a malfunction, in all the years I've been doing this.
When you start the dryer, voltage is supplied to the complete circuit, and the sensor circuit is closed,
As the glow bar igniter inceases in intensity and produces 2000 to 2500 degrees, the radiant sensor opens, allows a path to ground(shortest / quickest path) and the coils on the gas valve open and gas is released, the gas hits the hot igniter and ignites.
If the radiant sensor was bad you would have, either no glow from the igniter, or the sensor would not turn off and release the gas.
The fact that the glow bar continues to cycle off and on, tells me the radiant sensor is working proper, and the coils are bad, wont release the gas.
I hope this helps to understand the operation.
:) :) :) Hey Joe, I replaced the coils and while testing the dryer with the front cover still off (set aside as far as the connected door switch wiring would allow) the ignitor woulg glow and soon after the gas fired like it should!! Coils worked!! Only it went off (ignitor and gas) after 4 seconds, this cycle would repeat it self over and over about every minute. I was thinking it was a cycling thermostat (don't know much about them), but thought it odd that it would just happen to go at the same as the coils. Put the front cover door assembly on and retested just fine!? Out of curiosity, removed again and same "problem". Reinstalled cover/door again and ok! Is there something sensing that is preventing possible "backdraft" of CO gas with front cover off?? Lester
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Originally Posted by: LesterS Hey Joe, I replaced the coils and while testing the dryer with the front cover still off (set aside as far as the connected door switch wiring would allow) the ignitor woulg glow and soon after the gas fired like it should!! Coils worked!! Only it went off (ignitor and gas) after 4 seconds, this cycle would repeat it self over and over about every minute. I was thinking it was a cycling thermostat (don't know much about them), but thought it odd that it would just happen to go at the same as the coils. Put the front cover door assembly on and retested just fine!? Out of curiosity, removed again and same "problem". Reinstalled cover/door again and ok! Is there something sensing that is preventing possible "backdraft" of CO gas with front cover off?? Lester Lester, Everything is FINE ... With the front off and everything out of the unit, You've thrown off the air flow(too much air),and the blower doesn't draw the air through the burner properly, and it actually cycles the Hi Limit switch. You did a great job. Have at it ... :cool: :cool: :cool:
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