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Author Topic: Dryer runs, but doesn't heat up  (Read 20154 times)

Offline DannyT

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Dryer runs, but doesn't heat up
« on: August 05, 2010, 01:39:03 PM »

Wife put in load to dry on Perm Press, and ran it, went back to check it, and hadn't heated up at all.  Then put it on Regular and it dried to almost dry - lighter weight things were dry but heavier things were damp, but it shut itself off.  Then she put in another load, and ran it for awhile and nothing, no heating at all.

I am about to dig into it and was hoping that these symptoms would tell me what has to be replaced.

thanks

(not related) I replaced the rollers, the shafts they ride on, belt and and felt about 6 years ago and has worked fine.

Model SE-1000

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #1 on: August 05, 2010, 03:38:14 PM »
If your dryer has these on the inside they may be in need of a cleaning. Residue from dryer sheets goops up the strips and they cannot sense the dampness of clothes. The dryer thinks the clothes are dry and shuts down. Clean those with 409 or equivilent. Retry
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Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #2 on: August 05, 2010, 05:05:54 PM »
First off, thanks for your response.
We don't use dryer strips, but I went and checked those strips in the dryer anyway and they were real clean.

After I posted, but before your reply, I pulled the heat cone and checked the heating coil. I got continuity and what I gather to be 15 ohms resistance. (old Navy multimeter) There was a little bit of crud on the bottom of the cone - I guess toasted lint, but hardly any for as long as we've had this unit. I cleaned it, checked the high limit thermostat and it had continuity.

I also checked the cycling thermostat and it had continuity.

In the manual, they also list (under "Symptom" of No Heat):

Heater or gas valve (in this case that's the heating element) - check
Motor - that is running so I don't understand why that's part of this list
Wire Harness
Control board
Heater relay

What should I try next? 

Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #3 on: August 05, 2010, 05:32:23 PM »
Also, there is a label on the cover of the duct from lint trap to blower that reads:
"If thermal fuse is open, replace cycling thermostat(s)"

Could this be a factor? Would the motor still run (drum turns, blower blows) if the thermal fuse is open?

thanks

Daniel

Offline niobrara

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Re: Dryer runs, but doesn't heat up
« Reply #4 on: August 05, 2010, 07:57:13 PM »
no, check your vent.see if air is going outside.

Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #5 on: August 05, 2010, 08:01:32 PM »
Vent is clear. It's a very short run out through the wall. I pulled the vent pipe off the vent through the wall and it's blowing good as new.

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #6 on: August 05, 2010, 09:27:21 PM »
Check the safety limits
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Offline tgoods

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Re: Dryer runs, but doesn't heat up
« Reply #7 on: August 05, 2010, 11:37:36 PM »
Ohm the cycling and limit thermostats.  If they're good, check the heater relay.  You have to check the relay while it's running so be very careful.  Check for 24vdc to the coil of the relay, the red wire and the brown wire with black stripe.  If no voltage, you have a bad control board.  If you have voltage at the coil, check for a voltage drop at the heater wires on the relay. That would be the thicker black and brown wires.  If you get about 240vac, then you have a bad heater relay.
If your relay is bad, send me a pm. I have way more of these in stock than I'll ever use and I can give you a good deal on one.

Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #8 on: August 06, 2010, 11:44:32 AM »
Thanks.  I'll check that out later this afternoon.  The multimeter I have is fairly antiquated Navy issue, but the ohm meter has always worked for continuity. Probe ends and not alligator clips.
When you say be careful, what do you mean  (aside from the 24ov and the fact that the relay is hard to get access to? I'll post back results.

[attachment auto deleted after 5 years by admin]

Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #9 on: August 07, 2010, 01:31:51 PM »
Here's what I think is the heater relay.  The colors are different than you describe. Picture below. It looks to me like the 24vdc wires are the red, and white with red dashes and the heater wires are the plastic shielded yellow, and grayish brown wires. In any case you can probably tell me if the longitudinal location of the contacts on the relay relate to the 24vdc circuit and the 2 upper, outer contacts are the heater circuit.  I've unfastened it from the dryer to have better access to test, and to take this picture.

[attachment auto deleted after 5 years by admin]

Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #10 on: August 07, 2010, 02:25:35 PM »
After some more poking around on the net, I've discovered that the relay I've shown above is not the heater relay.  Rather the heater relay has a clear plastic color and is located directly under the heater coil.  Sorry. Will test relay and report back findings.

Offline DannyT

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Re:heater relay questions
« Reply #11 on: August 09, 2010, 06:37:19 PM »
I was unable to test the heater relay in place, and found a parts house nearby who said he had the correct relay based on my describing it as a SE-1000. His asst. said that they could test my old one before I bought the new one, so I took it in. Owner then informed me that he couldn't test mine, but it was cheap enough that I should just buy the new one. The relay he sold me is different even though he said it cross references to replace mine. My existing relay in the photo is larger and part# is 306199. The replacement I have  (he said it's smaller because it's solid state(?) is numbered 2202729 and it does say Maytag.
Is this correct? As they're not identical, does it matter which way the wires are hooked up? I presume it doesn't matter as there are no markings on the new relay - just the 2 sizes of spade connectors - small=low voltage; large=220v.
This may not be the fix, as I haven't determined that the old one is broke, but if it'll make my heater coil hot, I'm ahead and we can use the W/D again. thanks for your help.

[attachment auto deleted after 5 years by admin]

Offline DannyT

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better image of relays
« Reply #12 on: August 09, 2010, 06:45:58 PM »
original image seemed too small, so here's a better one.

[attachment auto deleted after 5 years by admin]

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #13 on: August 09, 2010, 07:56:38 PM »
The 2 small terminals are low voltage 24vac from the transformer. check for continuity between those 2 small terminal if open bad. simple. Check to see if the transformer has continuity on the low side and the high side of the transformer.
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Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #14 on: August 09, 2010, 08:05:13 PM »
<The 2 small terminals are low voltage 24vac from the transformer. check for continuity between those 2 small terminal if open bad. simple.>

I just did this test with my meter. The low voltage terminals on the original relay show no continuity and the new relay does! So that tells me that the original relay is bad. 
You didn't answer whether the new relay I got today (#2202729) is what I should use to replace the original (#306199) one. thanks

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #15 on: August 09, 2010, 08:19:34 PM »
If the guy you bought it from sold it to you and said it would work I would try it. This is really a generic part. What you have is a simple switch that gets turned on by low voltage. It ain't rocket science.
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Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #16 on: August 09, 2010, 09:46:04 PM »
Yeah, well, after trying to find the part number for this relay, and reading the manual, it appears that this guy sold me a relay for a gas dryer, not the electric model. In the manual it reads:
"The terminal configurations for the relays used in the gas dryers and the electric dryers are different. The terminals on the relay used in the gas dryers are located on the top of the relay.  The terminals on the heavier relay used for the electric dryers (and repair for both gas and electric) are located on the end of the relay."

So now I have the wrong relay, and from what the manual says I shouldn't use it - I could do the reverse - use the relay for the electric in a gas unit, but not the other way around.

The load for a gas dryer on the high voltage side would be much less than the 220v going through the relay for the electric model, no?
When searching for the correct part, it shows up here: http://www.apwagner.com/index.php?main_page=product_info&cPath=7_666&products_id=38224
...so it wasn't superseded by the one he gave me, and I doubt it would work for very long if at all.

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #17 on: August 09, 2010, 09:48:40 PM »
That part would not last too long maybe. I would go back and ask him if he thought the amp draw on that switch would affect the performance.
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Offline DannyT

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Re: Dryer runs, but doesn't heat up
« Reply #18 on: August 11, 2010, 09:43:24 PM »
So I have a new relay on it's way to me in the mail. It'll be a few days, maybe the weekend before I receive it.
The old relay had no continuity on the low side, so I'm assuming that relay is bad. [I did not check the heater relay in place with voltage to see if 24v to it closed it and thus activated the high voltage side. But the new (wrong) gas version heater relay did have continuity across the low voltage side.]

Question is, did the failure of something else cause the relay to fail (transformer?) and if there is some other failed part in this circuit with the heater will the new relay fail as well, or soon? What else should I check out before installing the new heater relay?
Or is the relay my only problem and once that's installed everything will be fine?

thanks

Offline JWWebster

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Re: Dryer runs, but doesn't heat up
« Reply #19 on: August 11, 2010, 09:49:37 PM »
Well you know they install limits all around the heater and blower. Of course their would logically be a limit somewhere. You gotta look.
May the hinges of our friendship
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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