Author Topic: Dryer Won't Heat  (Read 11669 times)

Offline TSOL68

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Re: Dryer Won't Heat
« Reply #30 on: May 28, 2010, 01:23:46 AM »
Did you give up on me already?  :)  Tonight I pulled out the drum and tested everything I could get my probes on, everything is in spec with the manual.  I re-tested valve 2 (pink and red wires) at the plug on the main board....Still not getting any voltage after the ignitor goes out.  Valve 1 (red and white wires) gets 100DCv as ignitor is on.  It seems that the mainboard is not getting the signal to open valve 2, could this be the ignitor not getting hot enough for the flame sensor to open the valve?

Thanks Again!

Offline Beehive Appliance

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Re: Dryer Won't Heat
« Reply #31 on: May 28, 2010, 02:16:31 AM »
This is where it gets difficult. I would lean towards telling you to try the ignitor. Unfortunately everything else seems to be okay. The ignitor has to be just right for the valves to open. It is merely a safety issue. I have seen it way to often on older machines. From reading the posts and the fact that you have replaced the board, I would replace it.
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Offline TSOL68

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Re: Dryer Won't Heat
« Reply #32 on: May 28, 2010, 09:41:48 AM »
Ok, I will try that.  This dryer is very heavily used.  3-4 loads a day, and my wife would even warm up the kid's blankets with it.  So maybe  the ignitor is just not getting hot enough

Offline john63

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Re: Dryer Won't Heat
« Reply #33 on: May 28, 2010, 11:00:56 PM »
The fault is likely the MAIN BOARD.

New parts can be a "dud".

The IGNITER only needs to provide heat for the FLAME SWITCH to "sense" it and to provide a source of ignition of the gas.
Amperage (the gas oven type) has no role in dryer burner ignition.

The gas coils are within specification (ohms).

The MOTOR SWITCH is okay--since the IGNITER functions.

The THERMOSTATS & THERMAL LIMITERS are good---the IGNITER is working.

Generally---when a FLAME SWITCH fails---the IGNITER will not glow or the burner never ignites.

Try replacing the FLAME SWITCH (p/n: 6501EL3001A) as this is not only a possibility but is relatively inexpensive.

If that fails to resolve the problem...

This still leaves the MAIN BOARD & the WIRE HARNESS as the most likely suspects.

« Last Edit: May 28, 2010, 11:20:21 PM by john63 »

Offline TSOL68

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Re: Dryer Won't Heat
« Reply #34 on: May 29, 2010, 10:37:10 PM »
Can I eliminate the wire harness since I tested voltage by inserting my probes into the plug that attaches directly to the main board?  I will order the flame switch on Tuesday.  Thanks!

Offline Beehive Appliance

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Re: Dryer Won't Heat
« Reply #35 on: May 30, 2010, 01:08:00 AM »
Your wire harness is fine. I am attaching a part of a manual which explains how the LG Gas valve flows. The Flame sensor has only a 50 degree spread between open and closed. open @370 closed @350 Have you put an ohm meter on the two leads of the flame sensor while you are trying to run the machine? if so, does it ever open (have no continuity)? this should be open when the ignitor is at its hottest point. I still think you have an issue with the ignitor not getting hot enough or the sensor never opens. One trick you may try is to carefully disconnect  one of the wires to the sensor while the ignitor appears to be heating. Do this with the gas off, and while you are measuring voltage to valve 2. This will tell you if everything above (board, wire harness) is working fine. If you have your voltage at this point you are sure it is either the sensor or the ignitor. I still would try the ignitor first because in my experience the sensors just don't fail that often.
« Last Edit: May 30, 2010, 01:09:34 AM by Beehive Appliance »
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Offline TSOL68

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Re: Dryer Won't Heat
« Reply #36 on: June 12, 2010, 02:52:37 AM »
OK, I got all of my parts and you are not going to believe this.... I still had the same problem, only 22DCV to the valve 2 plug.  I was about to give up but I decided to put the plug on valve 1 and then test 2 (I was testing with both plugs disconnected) viola!  I have 103DCV.  So I took off each part and tested.  Now I am back to my original equipment and I get 103DCV.  Since the dryer still won't heat, what now?  The gas coils?

Offline Beehive Appliance

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Re: Dryer Won't Heat
« Reply #37 on: June 12, 2010, 09:19:23 AM »
What parts did you end up getting?
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Offline RegUS_PatOff

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Re: Dryer Won't Heat
« Reply #38 on: June 12, 2010, 09:36:03 AM »
 
(I was testing with both plugs disconnected)
voltages are always tested with devices connected, unless otherwise directed.

back to square one ....
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Offline JWWebster

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Re: Dryer Won't Heat
« Reply #39 on: June 12, 2010, 09:59:41 AM »
The valve resistance is 1995 ohms and the ignitor is 185 ohms.  
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Offline TSOL68

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Re: Dryer Won't Heat
« Reply #40 on: June 12, 2010, 10:25:44 PM »
What parts did you end up getting?

Flame sensor, main board, ignitor

Offline TSOL68

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Re: Dryer Won't Heat
« Reply #41 on: June 12, 2010, 10:30:38 PM »

back to square one ....

The valve resistance is 1995 ohms and the ignitor is 185 ohms. 


Square one...  I had a appliance repair tech tell me it was the coils, without even looking at the dryer and that it would be $375 to fix.

Valve resistance.... Do I test across the terminals of each valve with the plug connected and and 120v AC unplugged?  Also, will this tell me if the coil is stuck or too weak to stay open? (that's what the repair guy told me)

Offline john63

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Re: Dryer Won't Heat
« Reply #42 on: June 12, 2010, 11:34:33 PM »
Unplug the dryer

Disconnect the wires at the gas valve coil # 02

Check the ohm of the # 02 valve--if not within spec or "open"--replace the GAS VALVE COIL ASSEMBLY.

Offline TSOL68

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Re: Dryer Won't Heat
« Reply #43 on: June 14, 2010, 12:16:18 AM »
Unplug the dryer

Disconnect the wires at the gas valve coil # 02

Check the ohm of the # 02 valve--if not within spec or "open"--replace the GAS VALVE COIL ASSEMBLY.

With my ohm meter on 2k, I get 1.922

Offline kandbs

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Re: Dryer Won't Heat
« Reply #44 on: July 21, 2010, 07:45:52 AM »
Did this ever get resolved, I am having pretty much the exact same symptoms with the LG 7188WM, I suspect the control board, but after reading your posts I'm not so sure.. would be nice to find a smoking gun, but it is eluding me thus far.

 

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