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Cloud44
Apprentice Appliantologist
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Posted: Sat Apr 19th, 2008 14:28 |
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Problem: cothes don’t dry sufficiently
The vent connected to the dryer is 4 inch rigid, smooth-wall aluminum ducting which exhausts to the exterior of the house. The total length of the vent is approximately sixteen feet with two 90 degree bends. I’ve checked the vent and it is clean. The exhaust port flap opens freely when the dryer is on.
Given that the dryer has operated well in the past, I don’t think that either the length of the vent or the two 90 degree bends is the issue.
I've checked the electrical outlet. It's OK (240 volts).
Moving on the the inside of the dryer –
I’ve also checked for lint buildup in the dryer and cleaned the small amount that I’ve found.
I’ve checked the heating element. Resistance of the heating element is 10 ohms. I’ve also observed it while the dryer is on. and it seems to be working well. Everything seems OK with it.
On the heater element housing, there are two thermostats or thermal cut-offs mounted. I’ve checked both, and both have continuity. They seem OK.
On the blower moder housing, there is a internal-bias thermostat mounted (Part Number 3387134). I replace this thermostat with a new one, but on second look there was nothing wrong with it. The new one is currently installed.
What should I check next, and how do I test it.
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RegUS_PatOff
Fellow, Academy of Sublime Masters of Appliantology
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Posted: Sat Apr 19th, 2008 14:48 |
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It could be a few things.
Is there good air-flow ? If not, one of the resettable thermal devices could be cycling.
Have you tried it on timed-dry ? The moisture sensor/control could be bad.
11062922100 Wiring Diagram
Last edited on Sat Apr 19th, 2008 14:50 by RegUS_PatOff
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Cloud44
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Posted: Sat Apr 19th, 2008 17:13 |
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The air flow is strong at the vent, although I don't know how to measure this.
The dryer seems to be operating equally poorly in both authomatic and timed drying modes.
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RegUS_PatOff
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Posted: Sat Apr 19th, 2008 17:38 |
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check the temperature at the rear vent with it disconnected.
with an empty load & timed dry
it should cycle between about 130F & 155F.
you could use a meat thermometer.
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Pegi
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Posted: Sat Apr 19th, 2008 20:22 |
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| Run the dryer with the vent hose disconnected, if it dries fine, need to address the vent system in the home...on high heat should cycle off around 155 or so...low heat around 135...
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Pegi
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Posted: Sat Apr 19th, 2008 20:24 |
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| Also dryer vents that have long runs or bends/elbows need to be cleaned professionally once or twice a year, has this been done.???? I am betting you have a venting issue......
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K,man
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Posted: Sun Apr 20th, 2008 02:52 |
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| PEGI another thing ive seen caused by poor air flow on w'pool DOTT dryer is the blower wheel blades will stop completly up. found it by accident dryer was vibrating it had slung the lint out of one blade causing out obalance wheel, worked fine after cleaning and correcting vent problem
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Cloud44
Apprentice Appliantologist
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Posted: Tue May 6th, 2008 13:36 |
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I ran a small load of closes (three hand towels) with the vent disconnected on the automatic setting. There was no difference in the dryer's performance. Towels were slightly damp.
With the vent disconnected, I used a digital meat thermometer to check the temperature during operation. This was an empty load on timed dry for 30 minutes. Initially the temperature went to 160 degrees, but then started to cycle down to 132 degrees and back up to 152 degrees. On some cycles the temperature varied by a degree or two. The thermometer I used had a base unit and a remote receiver that displays the temperature, so I attribute the slight variation to be due to the time lapse of the base unit sending a signal to the receiver. At approximately 10 minutes prior to the end of the drying time, the dryer cycled down to about 120 degrees then back up to 140 degrees before starting a slow cool down to 80 degrees at the end of load signal.
Next I ran a small load (again tree hand towels) on the timed setting for 40 minutes with the thermometer still in place. The dryer went up to about 155 degrees then began to cycle as it did before, including the cool down 10 minutes before the end of the load. The towels were slightly damp, although I think possibly slightly dryer than when run on automatic mode.
Note that I have already pulled the cover to the blower motor and checked for any lint buildup. There wasn't much, but I cleaned what was there.
Given that the vent is rigid metal, I don't think that it is excessively long. I put the rigid metal in about a year or so ago. Before the rigid metal, it had been flexible metal and operated fine for a number of years. Eventually, it became clogged, so I replaced it with rigid metal.
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applianceman18007260692
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Posted: Tue May 6th, 2008 14:15 |
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Did you remove the filter housing and wash it out?
the window there on the dryer where the hot air goes into the filter housing gets clogged. The only way to clean it is by removing the filter housing and washing it out.
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RegUS_PatOff
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Posted: Tue May 6th, 2008 15:05 |
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The temperatures sound OK, and if the air-flow is OK, and still no improvement in the Timed dry...
It may be the washer isn't spinning as much water out of the clothes ?
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appl.tech.29501
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Posted: Thu May 8th, 2008 01:11 |
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| also check your lint filter for fabric softner build up...can be hard to see sometimes but cause the symptoms you are describing.
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