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Dryer whining noise, duct was part blocked, whining better, why whining?

Dryer started making a whining sort of noise coming from the back - I checked the vent and it was partially blocked. I unblocked everything - the whining got a little better - do you think my dryer is ok? It still heats very well. It has always taken 1 hr to dry my clothes - recently it was taking about 1 1/2 hrs to dry at least. I found what looked like a mouse nest with bits of dogfood, insulation material and lots and lots of lint. The end of vent had a big hunk of lint too. I clean my vent screen every load - sometimes twice a load.

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  • darcycreatur Dec 13, 2008

    my dryer vent is making a blowing noise. The dryer is NOT pluged in what is it?

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Cleaning the lint trap often isn't enough to maintain proper dryer ventilation. No lint screen is perfect and some lint always gets past the intial screen. As you have discovered, rodents love lint as nesting material. It is common to find mice nests in places such as the blower fan assembly and along the dryer vent hose. I would recommend you inspect the vent about once per season. That is, four times per year. Most manufacturers recommend twice, per year, but I have found it better to check a little more frequently. The following link provides you with some good advice on proper dryer maintenance:

http://www.fixya.com/support/r385301-thorough_dryer_advice

Pay particular attention to the section that discusses dryer ventilation. Something as simple as a clogged vent can cause serious problems with the heating circuits. Not to mention, it can create potential fire hazards. I would recommend you try running the dryer for one load with the vent hose removed. If the load takes less time to dry, I would inspect your dryer ventilation thoroughly from the point it exits the dryer, to the point where it exits your home. If you are not using the semi-rigid metal type ducting, or if the vent line has not been replaced in a while, I would recommend you do so. The ducting is sold in 10 foot segments, is fairly inexpensive and easy to install. The air at the back of the dryer should be forceful and warm (about 140 degrees F). If the air flow is weak, and not very warm, you still may have problem internal to the dryer. Here's another link you can view that discusses proper ventilation installation:

http://www.fixya.com/support/r389357-dryer_ducting_installation_tips

The rule of thumb when it comes to dryer ventilation is the SHORTER and STRAIGHTER the ventilation, the better. Every bend, sag, or rise creates resistance for the blower motor and can create potential choke points for lint to clog. Vent lines that run through an attic or crawl space are generally the worst for clogs. Also, make sure the exhaust outside is at least 12 inches off the ground to prevent rodents from entering.

To answer your question, if the dryer seems to be performing well and drying as it should, you probably have no problems at this point. I would recommend, however, that you inspect the dyer interior to make sure you don't have lint build up inside. Since you said you had cleared a clog recently, I suspect you may have some lint build up in the cabinet. This can cause a potential fire hazard. I would also recommend you lubricate the dryer drum supports (rollers) at the point where the roller meets the axle with a light weight machine oil. DO NOT get oil on the rubber rollers. These rollers can also cause noise if not lubricated periodically. I hope you find this information helpful. Let me know if you require additional assistance.

NOTE: Make sure you UNPLUG the dryer before servicing the interior cabinet. There are still live voltages present even with the dryer turned off.

Posted on Nov 03, 2008

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Most of the time a tumble dryer will work like a dream but, as with all appliances, occasionally there will be technical problems.
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1 Answer

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http://www.youtube.com/watch?v=xGIG8Wo5-N4
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The rythmic rubbing sound you are hearing could be coming from a few sources. It could be drum support rollers that require lubrication, bulkhead screws that have come loose, the drum seal not seated properly, or a silencer plate that has come off the compartment side and is rubbing on the drum.

First, look inside the dryer along the seam where the drum meets the front and rear of the dryer. You should not see any part of the felt drum seal protruding inside the drum. Sometimes the seal starts to come loose or becomes misaligned and sticks through inside the drum. This will cause thumping and excessive noise. If you have anything caught in the drum seal (i.e., a screw, change, etc.) this can also cause excessive noise.

Remove the dryer top panel and start the dryer and watch for anything obvious rubbing on the drum. The top comes off by removing the screws in the rear and sliding the panel back, then up. (CAUTION: DO NOT get your hands around the drum while it is rotating and any of the electrical connections). Look for any vibration from from the rear bulkhead (this is the back wall of the dryer where the drum rides against). Sometimes the screws holding the bulkhead to the cabinet come loose.

Another thing to look for is a metal silencer plate that is usually mounted along the side panels. This plate is glued on and is used for noise reduction. Sometimes it comes off and will rub against the drum.

If everything checks out good, remove the lower panel under the door by removing the screws under the bottom edge (HINT: Placing a small block of wood under the front feet of the dryer can make this easier). The panel will drop down then come off. If it gets stuck, tap on either side to knock it loose. Start the dryer again and look/listen for any noises coming from the drum supports. The drum rides on the drum supports and they require periodic cleaning and lubrication.

The drum light could be a lamp socket problem and/or wiring. Make sure you are using the correct bulb as well. I believe the bulb is only supposed to be a 25W bulb. This isn't related to any long dry time problem.

The heat problem could be directly associated to clogged dryer ducting. If the dryer is full of lint when you open it, you will have to thoroughly clean the vent ducting and interior cabinet. NOTE: This is a fire hazard!

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Your heat problem may not be a component at all. Double check your dryer interior and ducting and let me know what you find. I hope this helps you.

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