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Author Topic: 70 series Kenmore electric dryer spins but does not heat  (Read 89698 times)

Offline llew_x

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70 series Kenmore electric dryer spins but does not heat
« on: February 16, 2009, 05:26:05 PM »

Hi,

I have a 70 series electric Kenmore dryer that I've been using for about 4 years. It's worked great up until tonight when I went to take my clothes out and they were still very damp. I reset the timer and checked it again about 40 minutes later and the clothes felt the same.

I bought this dryer from a Sears outlet store that sells appliances at slightly (supposedly) reduced price because of cosmetic flaws and I don't have a user manual or any exploded views of the inside of the dryer. I have a gut feeling from reading some other posts that It's probably my coils? I'm not sure but I do need some help and was hoping someone here could please give me some assistance.

Thanks,

Model 110.66752500
llew

Offline JWWebster

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #1 on: February 16, 2009, 06:32:22 PM »
check the vent. If it looks stopped up then the high limit is blown. Mounted on top of the heating element.
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Offline jumptrout51

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #2 on: February 16, 2009, 06:48:42 PM »
Are the clothes hot and damp or cold and damp?
Take a Kid fishing.

Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #3 on: February 16, 2009, 07:29:37 PM »
The clothes are cold and damp.

I did take the vent hose off and ran the dryer...all that came out of the vent was cold air.

-Llew

Offline jumptrout51

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #4 on: February 17, 2009, 06:25:03 AM »
With your volt ohm meter (VOM) check for 220 volts at the terminal block the cord attaches to.
If 220 is present, unplug the dryer and remove the rear panel.
With meter set to continuity check the thermostats and fuses on the heater as well as the heater coil. Remember to unplug the wires to each component to check them correctly.
Take a Kid fishing.

Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #5 on: February 17, 2009, 02:10:08 PM »
I finally got home from work and had time to fiddle with this thing a little bit.

It seems like I have continuity on everything I put my leads to.

Just to clarify what I'm looking at... The thermostat is located in the vent just upstream from where the vent hose connects?

The fuse is located near the bottom of the heating element?

I took some pictures but I can't post them because they're too big.

-Llew

Offline Repair-man

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #6 on: February 17, 2009, 04:01:13 PM »
"It's only expensive if someone else fixes it for you" -
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Offline jumptrout51

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #7 on: February 17, 2009, 04:30:53 PM »
Where Repairman said "cord goes here". Did you read 220 volts?
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Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #8 on: February 17, 2009, 05:52:18 PM »
Repair-man, thank you for the pic that points everything out!

There are 4 wires from my plug, a black on the left, white in the middle and red on the right and of coarse the ground in upper left. While plugged in my volt meter reads 247V with the leads on red and black, O.L. if on black and white or red and white.

-Llew

Offline jumptrout51

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #9 on: February 17, 2009, 06:26:55 PM »
You either have your meter set wrong or you have a neutral wire problem.
You should read 120 volts from black to white and red to white for a complete circuit.

Look closely at the wires at the terminal for a burned wire.
No burned wire, open the wall outlet and inspect the wires and the female connections.

Read voltage at the wall connection for 220 volts and 120 volts from hot to neutral on both legs.
« Last Edit: February 17, 2009, 06:35:36 PM by jumptrout51 »
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Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #10 on: February 18, 2009, 05:33:37 AM »
OK, I just went and checked it again. I must have got mixed up plugging and unplugging the cord. My multimeter is definately set to measure V/AC.

From black to white or redt to white it's 120V.

Black to red is 245V. The receptacle does say 30A -125V/245V.

So i'm going to go back at it when I get out of work today to recheck the thermostats and fuses and heater coils.
In an earlier post you mentioned to make sure I unplug the wires going to each component before I check them. Should I unplug both wires or just one? And as long as I get any reading other than O.L. then that means there should be continuity and the component is working, correct?

I really do appreciate your help!

-Llew


Offline JWWebster

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #11 on: February 18, 2009, 08:52:30 AM »
With the power disconnected you should take at least one wire off each thermostat and limit just to be sure you don't somehow get a false read. 
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Offline JWWebster

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #12 on: February 18, 2009, 08:57:07 AM »
If it runs at all and the heating element is OK then you most likely need a limit kit. It mounts on the element canister.

Dryer Thermal Cut - Off Kit, part number: AP3094244


« Last Edit: February 18, 2009, 09:02:12 AM by JWWebster »
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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

Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #13 on: February 18, 2009, 08:59:50 AM »
I'm sorry, I'm not too sure what you mean by "limit" after diconnecting at least one wire from each thermostat. Could you please further explain?

I really don't mean to sound stupid but I don't want to pretend I understand advice being given when I don't fully understand... I just want to get her fixed and be up and running again.

-Llew

Offline JWWebster

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #14 on: February 18, 2009, 09:08:51 AM »
You dryer has a series of safetys. If the control thermostat fails, the filter housing gets blocked with lint, or the vent gets stopped up  the heat could cause a fire. The bottom cannister thermostat limit is the lowest temp one 250F, it should shut down first if it fails then the limit mounted at the top of the cannister is set to Blow at 300F When it blows that is an indication of an external vent blockage. If the problem is from within the dryer then the fuse mounted on the blower housing will blow an the dryer won't run. The fuse is rated at 350F and is tied into the door switch. That is why the wires are smaller. They don't carry the heat load. If the duct fuse blows it is the same as if you opened the door. The dryer simply quits running.
« Last Edit: February 18, 2009, 09:11:31 AM by JWWebster »
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Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #15 on: February 18, 2009, 11:22:29 AM »
OK, good news...I think.
An electrician friend of mine from work came over the house to take a look at the dryer today.
With the dryer plugged in he checked terminal where the plug is and then started checking the fuses and thermostats. Everything seemed ok until he put his leads across heating coil terminals and found it to have no continuity.
We removed the heating element and found where a section of the coil was broken.

So I'm happy now that I believe I know what the problem is and all I need now is a part number for the heating coil.

Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #16 on: February 18, 2009, 11:53:14 AM »
Ok, so i clicked the link at the bottom of the page for Sears/Kenmore parts delivery, putt in model # in the appropriate field and couldn't come up with an exact match. It gave me 13 or so of the closest matches, the 3 listed that weren't coin operated look to be exactly like what I have....except one thing. The picture shows 3 different views of my heater element and none of those views is showing the High limit thermostat. Shouldn't the new heater come with the thermostat?

The part # I have, at least what I think it's supposed to be is AP2974879



Offline AJ

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #17 on: February 18, 2009, 01:58:48 PM »

Quote
So I'm happy now that I believe I know what the problem is and all I need now is a part number for the heating coil.

Heating Element Factory Part Number: 279838





Quote
Shouldn't the new heater come with the thermostat?

No

The high limit thermostat that is on the heating element is part number 3977767.



Offline JWWebster

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #18 on: February 18, 2009, 04:49:25 PM »
a 279838 is the 2nd highest priced of the 3 most popular.
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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

Offline llew_x

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Re: 70 series Kenmore electric dryer spins but does not heat
« Reply #19 on: February 18, 2009, 08:17:19 PM »
Ahh, cheap is good.

Question though....the terminal of the heater coil and the high limit thermostat are bussed together by what looks like either a spot weld or somehow crimped together. There's 3 little dimples that seem to be keeping the 2 components together.

Should I drill a hole in each and nut and bolt the two together?