Author Topic: Dryer Won't Heat  (Read 12349 times)

Offline TSOL68

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Dryer Won't Heat
« on: May 04, 2010, 12:07:23 PM »
Hi all.  I have a DLG3788W that doesn't heat.  I was trying to solve my problem by following an earlier post, but wanted to stay away from the "shotgun" approach.  My dryer symptom is that it doesn't heat at all.  I Tested valve 1 and it peaks at 126VAC when the igniter is glowing.  But after the ignitor goes out, valve 2 only gets 24VAC.  Could this be my problem?  If so, what could be causing this?  Flame dectector? or?  Thank you

Offline john63

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Re: Dryer Won't Heat
« Reply #1 on: May 04, 2010, 01:12:46 PM »
Hi all.  I have a DLG3788W that doesn't heat.  I was trying to solve my problem by following an earlier post, but wanted to stay away from the "shotgun" approach.  My dryer symptom is that it doesn't heat at all.  I Tested valve 1 and it peaks at 126VAC when the igniter is glowing.  But after the ignitor goes out, valve 2 only gets 24VAC.  Could this be my problem?  If so, what could be causing this?  Flame dectector? or?  Thank you

Good diagnostics...

Failed MAIN BOARD
Part # 6871EC1121F

Offline TSOL68

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Re: Dryer Won't Heat
« Reply #2 on: May 04, 2010, 04:18:41 PM »
Thank you for the quick reply.  Are there any diagnostics or tests I can perform on the main board?, just to make sure.  This part is probably not returnable.

Offline whirlpooltech

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Re: Dryer Won't Heat
« Reply #3 on: May 04, 2010, 04:56:12 PM »
If you order from the above link it can be returned.

From the RepairClinic website.

Quote
Return Any Part
Electrical parts? Special-order parts? No problem. We absolutely guaranty your money back if you decide to return a part within 30 days. And of course we'll refund your shipping and handling charges if we select the wrong part for you.

Offline john63

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Re: Dryer Won't Heat
« Reply #4 on: May 04, 2010, 07:40:26 PM »
Thank you for the quick reply.  Are there any diagnostics or tests I can perform on the main board?, just to make sure.  This part is probably not returnable.

Your diagnostics isolated the fault.

Valve no.2 should show 90-120 volts from the MAIN BOARD.

Offline RegUS_PatOff

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Re: Dryer Won't Heat
« Reply #5 on: May 04, 2010, 09:43:43 PM »
John63,
Why is it that some LG Dryer Service Manuals mention 90v AC at the Gas Valve Coils, and other LG Dryer Service Manuals mention 90v DC at the Gas Valve Coils ?

With the same Gas Valve part numbers.
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Offline john63

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Re: Dryer Won't Heat
« Reply #6 on: May 04, 2010, 09:56:10 PM »
Hello Regis

Most likely a service manual *typo*. Wouldn't be the first.
I cannot recall that the gas valve coils at one time were DC voltage--but I'll check & verify.

If that is the case--I'll definitely post that information.

John

Offline RegUS_PatOff

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Re: Dryer Won't Heat
« Reply #7 on: May 04, 2010, 10:02:18 PM »
such as
DLG8388 Service Manual = 90v DC

DLG8388 Training Manual = 90v DC
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Offline JWWebster

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Re: Dryer Won't Heat
« Reply #8 on: May 04, 2010, 10:58:22 PM »
If it was dc wheres the inverter?
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Offline RegUS_PatOff

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Re: Dryer Won't Heat
« Reply #9 on: May 04, 2010, 11:02:36 PM »
90v DC ...
 it's called a Diode
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