Dryer vent making noise when dryer turned off

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Old 03-22-20, 08:19 PM
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Dryer vent making noise when dryer turned off

Hello guys. Please watch the following video, which is only one minute long. It shows you what's up. I stopped the dryer cycle before it was done (as I usually do) and the vent would not stop making noise. I even closed the dryer door, restarted a cycle, then turned the cycle to off with the knob. Although that has worked before to make the vent stop making noise, it didn't work this time. Thanks!

https://youtu.be/p2bYzqyadS4
 
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Old 03-23-20, 04:13 AM
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Are you in a apartment? I have never seen a power vent a house. There is something in in vent hitting the squirrel Cage. You should be able to reach in Vent after you take off one pf the vent tubes.
 
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Old 03-23-20, 05:34 AM
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I've never seen a power vent on a dryer. My daughter's house has a power vent for the hot water tank, but that has gas fumes tol exhaust with no particulates involved. I agree with Pugsi, something in the power vent is amiss. Maybe bad bearings.
What I don't understand is how does one clean out the dryer vent in this instance? How long is the vent line that it needs an assist? Is this to code?
 
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Old 03-23-20, 10:09 AM
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Power venters are for pushing thru long exhaust lines. They are ok under code. Due to the longer exhaust lines it can be difficult to clean the system but it still needs to be done.

I'm guessing your question is why is it so loud ?
Something stuck in the impeller..... like dust and lint.... or possible bad bearings.

Or..... why isn't the fan shutting off ?
It's only supposed to run when the dryer is running.
Most of the venters use a current sensing circuit to activate the fan.
It's inside the box in the picture below. That may be defective.

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Old 03-23-20, 07:43 PM
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Technically, I'm in a condo. But, yeah, it's a highrise.
 
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Old 03-23-20, 07:50 PM
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This question is why was it still running even though I turned the dryer off. I did get it to stop eventually by closing the door, turning it on, and then turning the dial to turn it off.
 
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Old 03-24-20, 04:00 AM
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Hear are a couple of things I can think of. First is current flow sensor going bad.Other thing is dryer is still drawing current. Would need a meter to check which,
 
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Old 07-13-20, 05:40 AM
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What kind of technician do I need to call?

The dryer vent is not turning off again and this time the problem appears to be permanent. This is the noise the dryer makes after it has stopped running. I already tried closing the door, turning the knob to on, and turning it to off. Won't stop making this noise:

https://youtu.be/2-oVjQ81sjc

Here are a couple photos of the box that connects to the vent:




 
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Old 07-13-20, 06:08 AM
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Looks like a pressure switch to me.

Disconnect the tubing from the bottom of the switch and see if the vent fan shuts off.
 
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Old 07-13-20, 06:21 AM
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1. What is the procedure?
2. If I turn off the circuit to the dryer, will I be safe?
 
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Old 07-13-20, 07:48 AM
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Hold the silver nut and then unscrew the black nut,

You should not have to turn anything off.
There is no electrical down there.
The electrical contacts will be up in the black round section of the switch.
If you take the silver cover off the box then you should shut the power off.
But if it makes you feel better shut the power off.
 
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Old 07-13-20, 11:04 AM
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Yes.... that is a pressure switch. It may be internally adjustable. It is supposed to turn on the exhaust fan only when it senses the pressure from the dryer air. The switch or line could be plugged with lint. The switch could be frozen.
 
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Old 07-14-20, 04:24 PM
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There is no electrical down there.
The electrical contacts will be up in the black round section of the switch.


What does that mean exactly. The silver box is mounted to a round black thing.

Also, if I unscrew this nut and it shuts off, can I just screw the nut back on and use the dryer again?

 
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Old 07-14-20, 04:30 PM
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That means that it is a air tube. No electric under there just the tube connected to internal pressure switch. Take it out and vent may shut off. If contacts are welded shut than it will stay running and you need a new switch. If it shuts off than you need to clean the tube and where it enters the vent. Still might need a new switch.
 
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