Question about Hoover U6437-900 / U6439-900 Windtunnel Bagged Upright Vacuum

6 Answers

Hoover Windtunnel shuts off

My Hoover Windtunnel shuts off after 2 minutes of use. I have replaced the bag and filter but it still shuts off.

Posted by on

  • 4 more comments 
  • personalvelo Jul 30, 2008

    I have the same problem. It's as if a circuit gets blown but I can't figure out where- and at some point after resting it resets.

  • epsteinal Jul 31, 2008

    Response from Hoover:

    Hello, Thank you for your recent email. The vacuum has a thermal protector that
    will shut the vacuum down if the motor begins to overheat. While this could be
    caused by a failure of the motor or thermal protector, it is important to
    remember that a vacuum works on air flow. Air that is brought into the bottom of
    the vacuum travels up the hose, into the bag or canister, and as the air exits
    the system; it blows over the motor cooling it. If there is a restriction in air
    flow, including a clog or dirty filters, the air may not be flowing over the
    motor to cool it and the vacuum could be shutting down because of this. We would
    recommend checking all filters, especially if they have not been replaced yet
    this year, check for any restrictions in the air flow and check the force of the
    air blowing out of the unit. If this does not help to identify the cause of the
    unit shutting down, we would recommend contacting a service technician for a
    proper diagnosis and inspection of the motor or thermal protector. For
    additional troubleshooting assistance, please refer to your instruction manual
    which can be downloaded by visiting
    /Manuals/default.aspx. Thank you for your time in this matter. Sincerely,
    Customer Service 41 1-330-499-9499 Monday-Friday 800am to 700pm EST

  • djlmdl Aug 12, 2008

    Same thing! It stops all by itself.

  • Anonymous Sep 07, 2008

    Hey, me too. Depending on the carpet height and how much it has been used that day, it may shut off by itself after a few minutes.

  • epsteinal Oct 02, 2008

    Thank you for the response. I did fix it by taking off the cover over the brush roller and cutting away the hair that had accumulated around the roller.

  • Sandra Waeiss
    Sandra Waeiss May 21, 2013

    Mine started doing that a few days ago


6 Answers

  • Level 1:

    An expert who has achieved level 1.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 8 Answers

I found the following solution on this website. I have searched for hours and finally found this solution, it works! I HAD the same problem after cleaning the filter mentioned below, it is now working like it was new.

***by maverick_bea***
yes this machine has a thermal protector in it to shut off the machine if it gets to hot, this is normal. if there is no clogs in the hoses or in the machine then you will need to wash the filter at the top of the machine. you will have to remove the dirt cup and at the top you should see a half moon orange, well inside of this piece is the washable filter, clean and let it dry completly before putting back into machine. if this gets dirty and has not been cleaned, you can lose alot of suction. in some cases if this filter is not cleaned it can cause the machine to overheat so bad that it can damage the motor.

Posted on Oct 25, 2009

  • Dan Micu
    Dan Micu May 09, 2015

    No is not normal .. not after 2 minutes


  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 20 times.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 3 Answers

I had same problem. Turned out to be the filter that sits above the waste cannister. Remove the waste cannister. There is a little orange lever that releases the filter. It was caked with dirt not allowing any air flow causing the motor to overheat.

This foam filter gets dirty pretty fast.

Posted on Mar 01, 2009

  • 2 more comments 
  • osbellnet Jan 02, 2011

    Helloo Everyone,

    I resolved this issue by cleaning all the area where the roller resides. There is also a second compartment (plate) that must be clean under the roller area. It is located on the right side, you will see the screw holding the plate in place. This vacumm depends of air cooling and if for any reason a duct is cloged, it will activate the thermal switch to protect the motor. After cleaning the the roller area, my vacumm worked without shuting down every 40 seconds. I went ahead and replaced all belts and filters as well, as a preventive maintenance. I hope this help.


    Oscar Fonseca

  • Kelly Shoppell
    Kelly Shoppell Jan 07, 2011

    So glad I found this site! I didn't even know about that filter above the waste canister! Mine shut off and I had no idea what a thermal protector was until I looked in the book. Found that filter and it was so clogged I'm surprised it didn't shut off before. Boy did i feel dumb! That'll teach me to read the book!

  • Erin DiPiano
    Erin DiPiano Apr 14, 2016

    basically, clean everything hahah

  • Debbie Guyette Dugas
    Debbie Guyette Dugas Oct 23, 2016

    I was getting ready to throw mine out and buy a new one until I found this. I did exactly what was said, and BOOM! My machine is like brand new. Thank you!!


  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 2 Answers

The thermal protector gets messed up if it has to trip too many times, and can start tripping as soon as it barely warms up. I had to bypass my thermal protector and just go over it very completely to make sure theres no clogs or dirty filters often, as it costs $50+ to have the $80 vaccume serviced... recommend getting a less cheap vaccume intended for heavier duty next time around.

Posted on Jan 02, 2013

  • Erin DiPiano
    Erin DiPiano Apr 14, 2016

    how did you bypass it? slash how to keep safe still?


  • Level 1:

    An expert who has achieved level 1.


    An expert whose answer got voted for 2 times.

  • Contributor
  • 1 Answer

In order to prevent the aforementioned problem I cut out all of the Hoover filters, dramatically reducing the motor's workload and extending the number of consecutive minutes for which I was able to vacuum without triggering the thermal protector. The thermal protector itself is the next component that I intend to disable.

Posted on Mar 20, 2009

  • Erin DiPiano
    Erin DiPiano Apr 14, 2016

    and then you used the vacuum with no filter? how does that effect it's functioning?

  • Sandy Gossett
    Sandy Gossett Oct 14, 2016

    My filters were causing the shutting down of less than a minute running. I cleaned the top filter and removed the bottom one as I didn't have one to replace it. While waiting for the top filter to dry I went ahead and ran my vacuum, it never shut off not once! Not that I would suggest doing this, but I figure one time is not going to hurt and I needed my vacuum right then. I will wait for the top filter to dry and put it back in, and maybe I will order a new bottom one, maybe not! Also I pulled my cord completely out (and it was pretty hot) and will not run it with it in there again. Seems to me you get better air flow if it is not in there! Hope this helps someone out there as I was ready to take it to the dumpster now I'm so glad I didn't!


  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert who has written 50 answers of more than 400 characters.


    An expert whose answer got voted for 20 times.

  • Expert
  • 97 Answers

Sounds like you have a clog, which is a fairly common problem with these.

Check the air inlet immediately aft of the brushroll for clogs, then make sure the main wand and hose are also clear. If you have the machine on, check at the end of the hose for suction. This is a fairly common problem for all uprights with tools on board. Their airflow is very low, so they tend to clog up easily and then overheat the motor.


Posted on Oct 01, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Tried different outlets, tried waiting for it to cool a bit, tried emptying case. now i just washed filter, but will have to wait till it dries for results.

Posted on Apr 14, 2016

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

As I was vacuuming my vacuum cleaner stopped working

Hi, it's Allie from Crucial Vacuum!

Your Hoover Windtunnel may have stopped working for several reasons. First, make sure that your unit is properly plugged into an electrical outlet and make sure the electrical outlet is working correctly. Vacuum units, and other appliances, protect themselves from sudden electrical charges, ups and downs. Make sure the electrical fuse and breaker are on, if not reset breaker.

Some units may heat up and will automatically shut themselves down to prevent fires. Allow your unit to cool down for 30 minutes while the thermal protector is automatically reset. Overheating, may have been caused by a clogged hose, dirty filters, full bags or a roller brush that is not running properly. All these situations compromise the unit's air flow and make the unit work harder, making it to heat up.

To avoid these situations and to keep your unit running at it's maximum capacity, make sure to change filters regularly (recommended every 3-6 months), clean your brush roll from any tangled hair strands or debris monthly (roller brushes are recommended to be replaced at least yearly), and replace belts every 6 months.

You can purchase direct your replacement belts, bags, roller brush and filters from Crucial Vacuum with free shipping and an exclusive 10% coupon for readers, use code: FIXYA10

I hope this was helpful. If you would like further assistance, please feel free to give us a call at 877.750.9239. We have helpful and friendly customer care representatives on the line ready to assist you.

Alejandra (Allie) Sepulveda-Rivera
Crucial Vacuum Customer Care

Oct 04, 2014 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Why is my hoover windtunnel vacuum cleaner shutting off?

Hi there! Sounds like the thermal protector is being activated. This is usually caused by a clog or a filter that needs to be cleaned or replaced. Follow the steps below to prevent the unit from shutting off.

1. Remove the hose completely.
2. Use a broom stick to gently loosen and clear hose of clogs.
3. Remove the bottom plate and brush-roll.
4. Use a wooden spoon or something similar to break up and remove any clogs from lower hose.
5. Check the primary filter behind the side grille. If it is dirty you may rinse it under running water and allow 24 hours to air dry outside the vacuum.
6. Remove the bag door. Clean the primary filter located on the vacuum under the bag. Rinse with water and allow 24 hours to air dry outside the vacuum. The primary and secondary filters should be replaced at least once a year.
7. Check that the bag is not full. If it is, replace the bag.

The vacuum will turn back on when it cools off. This can take up to an hour. Hope this was helpful!

Jul 08, 2014 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Vacuum shuts off while in use

There is a thermal reset inside the motor that shuts it off. There may be a clog.somewhere or something restricting the airflow, it could be clogged filters. If there are no clogs or restrictions it is possible the thermal reset is bad in which case you will have to replace the motor.

Jan 26, 2014 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Mach 4.7 runs for 2.5 minutes and shuts off

Did you use it to vacuum up fine materials like powder? If you cleaned the filters, but they are original to the machine, replace them. Try changing the bag to a fresh one as well. Beyond that, check how freely the brush turns. If it doesn't turn freely that can but excess load on the motor, if its covered in threads, remove those.

Aug 01, 2013 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Hoover Windtunnel Bagged upright vacuum is smoking and belt is slitting and burning

you probably need to replace your brushroll seeing that your belt is burning means motor is turning. first check you brushroll and see if there is an obstruction keeping it from spinning if its not spinning freely replace

Jan 16, 2013 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Shuts down after a few minutes of work

make sure all filters are cleaned sounds like motor overheating...

Oct 31, 2009 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Hoover Windtunnel shuts down after 15 minutes

Might be that its not exausting enough heat & stutting its self down..

Try cleaning all the filters & the hepa filter..
This will increase air flow & maybe fix the issue..

Hope this helps !!
rate me good ;o)

Jul 14, 2009 | Hoover U6630-900 WindTunnel Bagless...

1 Answer

Windtunnel ultra U6425-900 stops running after 5 minutes

Sounds like its overheating and cutting out.
This is normally caused by a blockage or blocked filers.

Please leave feedback

Feb 07, 2009 | Hoover U6437-900 / U6439-900 Windtunnel...

1 Answer

Just not sucking like it did

the impella on the motor is clogged and needs to be scraped. dissasemble and its an easy fix from the bottom of the unit

Jan 23, 2009 | Hoover U5453-900 WindTunnel Supreme Bagged...

1 Answer

Hoover u5720-900 quits running and restarts again after some time

There is one more filter under where the collection tank & Hepa filter sits -- there is one screw that holds the cover down - remove that filter and clean it that will help. I also find I need to vacuum the hepa filter as well- it is too expensive to replace all the time. The Hepa filter can be placed inside a plastic bag and shaken really good to get the dust off of it

Jul 27, 2007 | Hoover U5720-900 WindTunnel Upright Vacuum

Not finding what you are looking for?
Hoover U6437-900 / U6439-900 Windtunnel Bagged Upright Vacuum Logo

14,390 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hoover Vacuums Experts

Les Dickinson
Les Dickinson

Level 3 Expert

18386 Answers

Gerry Harvey
Gerry Harvey

Level 3 Expert

1456 Answers

Brad Brown

Level 3 Expert

15334 Answers

Are you a Hoover Vacuum Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides