Author Topic: Dryer runs, but doesn't heat up  (Read 8933 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.

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.

 

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