Author Topic: Whirlpool gas dryer runs, no heat  (Read 3919 times)

Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #10 on: October 16, 2012, 10:29:40 AM »
Thanks RegUS_PatOff:

Good point. I did verify motor switch operation, both through continuity tests and voltage. The burner circuit passes through contacts M1 & M2 on the motor switch. I checked continuity through them with wires disconnected & unit running, and the switch closed and opened as I started & stopped the unit. Then I connected the wires and ran the unit and there was no voltage drop across the terminals, which verifies they were closed during operation. But I was suspecting that myself as I did clean out a fair amount of lint.

Take care,

JAD
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Offline lesguns

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Re: Whirlpool gas dryer runs, no heat
« Reply #11 on: October 17, 2012, 09:14:14 PM »
Check the coils!

Offline JWWebster

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Re: Whirlpool gas dryer runs, no heat
« Reply #12 on: October 18, 2012, 01:15:16 PM »
I bet that timer can be easily taken apart by removing the timer motor first then taking a peek inside without disturbing the contents.
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Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #13 on: October 18, 2012, 04:35:07 PM »
Thanks JWWebster:

I was thinking the same thing and will find out tomorrow. Let you know how it goes.

JAD
Having is not always so desirable as wanting . . .

Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #14 on: October 18, 2012, 04:43:53 PM »
Thanks lesguns:

I did check the coils and they tested good with a VOM. The problem seems be occurring before that parts of the circuit, since the voltage is far below what it should be to the coils and ignitor circuit. I will be going back tomorrow and will see what the deak is then.

Thanks again,

JAD
Having is not always so desirable as wanting . . .

Offline RegUS_PatOff

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Re: Whirlpool gas dryer runs, no heat
« Reply #15 on: October 18, 2012, 10:46:38 PM »
... determine where it drops from 110VAC to 40VAC
measure voltage from each thermal device to chassis (a good ground)
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Offline ronaldwe

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Re: Whirlpool gas dryer runs, no heat
« Reply #16 on: October 19, 2012, 10:02:05 AM »
Check for conductivity from  the sensor directly across from your ignitor, If you dont get any resistance replace the sensor.

Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #17 on: October 19, 2012, 03:23:44 PM »
Got it!   O0 

The culprit turned out to be the thermal fuse, P/N 3392519. I have never seen one do this, but it had continuity when checking it with the ohmmeter, however under load it dropped voltage but was not fully open. Usually these are either good or open. When I checked continuity last time out, I unplugged both wires to be sure there was no outside interference to the readings, and it tested good.

This time, I first looked at the timer as was discussed and when I checked the contacts under load, it was good. Then I started following voltage back through the circuit from ground and when I came across the other side of the thermal fuse with the unit running and set for heat, I got a reading, hence the 40 VAC at the burner assy. So I jumped out the thermal fuse and it fired right up.  :cheers:  Mystery solved.  :thanks:  Appreciate everyone's input.

Have a great weekend all!
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Offline lesguns

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Re: Whirlpool gas dryer runs, no heat
« Reply #18 on: October 19, 2012, 03:35:24 PM »
glad you solved it and good to know-i havent seen one ever do that.

Online tgoods

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Re: Whirlpool gas dryer runs, no heat
« Reply #19 on: October 19, 2012, 09:39:26 PM »
The first time I heard of intermittent thermal fuses, I didn't believe it.  But now I've seen it myself at least a half dozen times.

 

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