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

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Hover mach 4 vaccum

Thermal overload switch went off how do i reset it

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Re: hover mach 4 vaccum

Usually caused from being plugged, so first find the plug and clear it. The motor has an automatic reset, should restart after about 30 minutes, if it continues to shut off, there is still a plug.

Posted on Dec 17, 2007

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Re: hover mach 4 vaccum

I have checked everything and I do not see any plugs anywhere. I have cleaned the vacuum inside out.

Any other ideas?

Posted on Dec 28, 2007

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How do I check brushbar motor on dyson dc25 allfloors vaccum

Have you checked the reset switch on the side of the brush bar and ensured that it is pushed right in. This could have activated if a lot of waste material had wrapped around the bar or if it had overloaded in some other way.

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I have a Hoover Mach 2.7 Windtunnel that shut off during use and wouldn't turn back on. Was doing kitchen floor and running fine. Though a breaker tripped but didn't...what could it be?


It sounds like your thermal reset switch inside of your Hoover may have gone bad. When a vacuum cleaner doesn't turn on it, it's either caused by one of four things.
  1. Electrical Short in your Cord.
  2. Plug has gone bad.
  3. Motor of your vacuum is faulty
  4. The On / Off Switch has gone bad, and/or your Thermal Reset Switch has gone bad
Since this happened while you were vacuuming, I would guess that this is either your electrical plug that's shorted out, or that your thermal reset switch has shorted out. Your model Hoover was built with a protection system that is supposed to automatically shut down your machine if it senses any excessive heat. This mechanism is controlled by a Thermal reset switch which is located in motor compartment. This part is notoroious for failing, even when there's no overheating that's occured.

Before you disassemble the entire machine to check this part though, I would try testing the On / Off switch in your machine, as well as testing the electrical cord, which will also let you know if your plug has gone bad.

Here's a link to a solution I've done here on FixYa explaining how to check the On / Off switch;

While you have this apart, you can use the same electrical tester to test your cord. Simply put one end of the test into the terminal from the switch, and the other end of the test on one of the metal prongs that plugs into the wall. See if you have continuity here, if not, switch to the other prong of the plug and see if this helps.

If not continuity, this means your plug, or your cord has failed. If you do have continuity, this means that it's either the On / off switch, or the Thermal Reset Switch that's gone bad.

Here's a link to the solution that I've done on here showing how to replace the Thermal Reset Switch on your vacuum cleaner:

If you'd like some more help diagnosing this vacuum, please feel free to just use the comment field on the bottom of this page. I'm always happy to help you do some more advanced diagnosing, or answer any questions you may have.

If you found this solution helpful, please be so kind and rate this repair helpful, or leave feedback for me. This is greatly appreciated by the FixYa community. Thanks so much,

Chris Jones

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I was vacuuming with bissell 3750-T and I shut it off and went to turn it back on and will not start or do anything, what is wrong?

If you can't smell burning then it's probably a broken power switch or the vacuum got too hot and the thermal overload protection has tripped. Try leaving it off for 15-30 minutes and try it again. The thermal overload will reset itself during this time and it should work again.

In the meantime, make sure you have power to the vacuum, check for any blockages and check that the rollers in the cleaning head will turn by hand. Also, give your filters a clean. Any of these could cause the vacuum to overheat.

If you've already done this and/or power doesn't return after 15-30 minutes, I would start by checking the switch.

A couple of questions . . .

1. Does the power switch feel "normal" - basically does it have a positive feel when you switch on and off?
2. How long had you been using the vacuum before it stopped working?

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My vaccum cleaner will not turn on...i checked the outlet and it works but no power to my vaccum

Some vacuums have a resettable circuit breaker in case of overload or switch in case of blockage. Both are usually a pushbutton type thing (like on a powerstrip). Find it, reset by pushing, and run the motor. Check for obstructions and for anything that could be preventing the brush-roller from turning. If the breaker or switch trips again there is a problem that needs to be resolved.
The manual might be helpful.

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it does have an internal thermal overload device you need to put the vacuum into the shop they should be able to fix it in a few days

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The Agitator Overload switch is located on the top of the base assembly. Unplug the vacuum and press the reset button. The vacuum also has thermal protection, which will reset itself once the vacuum cools. The agitator will also stop when the vacuum is in the full upright position.
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Hi, vacuum clogged and motor shut down, how do I restart. thx

I'm assumeing you have remove the clog so unplug the machine an let it set of about an hour then plug it in and before you turn it on get it ready to vaccum then turn it on the overload switch should reset and it should run

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it sounds like your thermal fuse went out and u have to open it up ant test the fuse with a multimeter...I had the same problem and had to replace the thermal fuse...I ordered a fuse(sf188e) from ebay...cut the old one out and soldered in the new one...hope this helps.

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Fantom Cyclone XT Vacuum Cleaner

Here is the owners manual which goes over some troubleshooting problems.

At first I would think it was the thermal overload, which is covered in the manual. But I would guess that you have let it sit for 30 minutes to cool down and tried again and the vacuum still didn't work.
I would think you may have one of four problems.
1. Your thermal overload was tripped and is stuck and will need replaced.
2. You have a clog in your vacuum lines or the brush roller is froze, which keeps causing the thermal overload to trip.
3. Your power cord has a short, which would need replaced.
4. Your power switch is bad, which would need replaced.
Out of these 4 possible problems I would say the only one you could fix on your own would be problem #2. Make sure the vacuum is unplugged and take the brush roller off and clean it, make sure it moves free. Check your vacuum lines to make sure you do not have a clog, other wise the motor does not get air flow to cool it down causing the thermal overload to trip. As for problem 1, 3, and 4 I would suggest taking it to a repair shop.
Hope this helps, post back.

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I know that Karchers steam cleaners have had issues with the thermal overload. I have repaired Karcher machines that got turned on with no to little water in the tank and it would heat up really fast and trip the thermal overload. The thermal overload is to reset it self when it cools down but the problem has been the thermal overloads get stuck and dont reset. When they stick, they will give the same signs you have said. In those cases the thermal overload has needed replaced. The thermal overload did its job to trip, but it fails when reseting. I understand you don't want to throw more money into it, but that is the only thing you can do. You can get the part and do it your self, but they are tricky machines to get into and you dont want to break something trying to get in. Hope this helped.

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