Author Topic: Whirlpool gas dryer runs, no heat  (Read 3066 times)

Offline JADsvc1

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Whirlpool gas dryer runs, no heat
« on: October 15, 2012, 02:34:22 PM »
Hey guys:

Working on a Whirlpool gas dryer model LG5551XTW0. Customer complaint was runs but no heat. Pulled front to access burner & observe ignitor. Ran unit found no ignitor glow. Checked & found the following:

IGNITOR: Continuity - 72 ohms (within Whirlpool's noted range of 50 to 300 ohms)
FLAME SWITCH: Continuity - 0 ohms
CONTROL T-STAT: Continuity - 0 ohms, heater ckt good
THERMAL FUSE: Continuity - 0 ohms
HIGH LIMIT T-STAT: Continuity - 0 ohms
MOTOR SWITCH CONTACTS M1 - M2: Continuity - 0 ohms while running, wires disconnected.
TIMER CONTACTS: At R to B terms: Continuity - 0 ohms

So it seems as if the circuit is good and should provide power to the ignitor. Though this would not prevent the ignitor from operating, I also checked the coils on the valve and all show continuity. I then unplugged the wire to the burner assy and checked voltage with the unit running and found that (wires 1V to 3V) to be at 40VAC. That didn't seem right to me, so I manually bypassed each t-stat, the thermal fuse, the timer contacts and the motor switch one at a time and came up with the same results.

I must be missing something. Any ideas?

Thanks!

JAD
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Offline Bailey

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Re: Whirlpool gas dryer runs, no heat
« Reply #1 on: October 15, 2012, 04:24:24 PM »
Any one have a wiring diagram we could see?

Offline AJ

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Re: Whirlpool gas dryer runs, no heat
« Reply #2 on: October 15, 2012, 04:27:22 PM »
Any one have a wiring diagram we could see?


Here you go...
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Offline theoldstoveguy

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Re: Whirlpool gas dryer runs, no heat
« Reply #3 on: October 15, 2012, 09:27:04 PM »
Sounds like the timer as when using a meter (9 volts ) it shows good but may not be allowing voltage(bad contact) to be full when 110 goes across.

Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #4 on: October 15, 2012, 09:49:54 PM »
Thanks for your input OldStoveGuy.

I had wondered if the contacts could be breaking down under load. Everything else sure looks good. Thinking also that I may try following the circuit through and seeing if I could determine where it drops from 110VAC to 40VAC. I just rarely have trouble with dryers, so this one threw me a curve!

Since I am primarily familiar with Frigidaire/Electrolux products and not quite so familiar with other brands, I wanted to run this past the rest of the folks here to see if someone else has come across this in Whirlpool dryers in particular. Every brand seems to have their own quirks.

Take care,

JAD
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Offline RegUS_PatOff

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Re: Whirlpool gas dryer runs, no heat
« Reply #5 on: October 16, 2012, 02:40:53 AM »
... determine where it drops from 110VAC to 40VAC
measure voltage from each thermal device to chassis (a good ground)
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Offline JWWebster

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Re: Whirlpool gas dryer runs, no heat
« Reply #6 on: October 16, 2012, 07:48:28 AM »
That timer looks like a cheap build with leaf switches inside it.
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Offline AJ

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Re: Whirlpool gas dryer runs, no heat
« Reply #7 on: October 16, 2012, 08:23:45 AM »

That timer looks like a cheap build with leaf switches inside it.


I see the timer is NLA for this model.
Dryer Timer Part # 3394734

How old is this dryer?
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Offline JADsvc1

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Re: Whirlpool gas dryer runs, no heat
« Reply #8 on: October 16, 2012, 08:39:35 AM »
Thanks guys:

I didn't look for build date on unit while there. The parts manual is dated 1992. Serial number is MB5108799. I don't know date codes on Whirlpool products, but my guess is 15 - 20 years old. That would explain why the timer is NLA.

Yes, it looks like a low end timer. I probably couldn't even disassemble and burnish contacts for a temp fix.

I will run through the voltage checks though to be sure, but I think everyone is looking in the right direction and it is the timer.

Appreciate everyone's input! Have a great day!

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

Offline RegUS_PatOff

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Re: Whirlpool gas dryer runs, no heat
« Reply #9 on: October 16, 2012, 09:52:34 AM »
... I think everyone is looking in the right direction and it is the timer.
could also be a bad Motor Centrifugal Switch
(clogged with lint)
voltage tests would confirm

Brand: Whirlpool
Type: Dryer
Country: USA
Model: LG5551XTW0
Serial: MB5108799
This product appears to have been manufactured the week of December 14, 1992. 
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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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        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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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 . . .

 

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