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Does the motor overheat switch need to be replaced if it has tripped and reset on Hoover model u3940

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Most of the Hoover overheat control switches reset when you UNPLUG the cleaner, and let is cool down for twenty minutes with the cord unplugged.

Posted on Oct 03, 2009

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Where is the thermal protector sensor on hoover vac.


On most vacuum cleaner models it is built into the motor and cannot be changed without replacing the motor. In my experience the reset switch goes bad more often than the motor does which is why I recommend vacuum cleaners that have an external reset switch.

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My new Hoover 2100 Model number PU 2110-001 stops for 20 minutes every 4-5 minutes of use. It seems to get too hot. It has done this since new, I have changed the dust bag & all filters, but it makes...


AS new return to shop, Not fit for purpose, they should replace it. sounds as if thermal fuse is tripping in the motor, resets itself when cooled down.

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The majority of hoovers do not have reset buttons. Some vacuums that do, have one that only controls the brush roller when they are run by a separate motor. I would really need the machines model number to properly answer your question.

Although they do not have "reset" buttons, most do have thermal resets. If the vacuum motor overheats. Turn off, unplug and wait for 1 hour or more for the thermalfuse to "reset" itself. Also, clean or replace all bags/filters because that's usually the cause of overheat in the first place.

Also, vacuums go dead for a number of electrical reasons. Many of the Hoover uprights have an internal switch in the upper body below the handle that commonly fails and needs replaced.

Hope this helps.

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The electric motor inside your Dyson has a built in over-current trip to protect itself (and you if it seriously overheated and caught fire). This normally automatically resets itself, however if the motor has just about had it, next time it is switched on it just trips again.

The primary cause of motors overheating is that the filters are not cleaned or replaced frequently enough. Dont be fooled by Dyson's "lifetime filters". They need to be regularly cleaned and replaced when necessary.

Replacement motors are available on eBay2_bing.gif for about £25, however replacing one requires good DIY skills and tools.

Have a look at www.dysonmedic.com and see if you feel you can tackle it yourself. If not, take it to a repair shop or call the Dyson helpline.

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The motor has a built in over-current trip to protect itself (and you if it seriously overheated and caught fire). This normally automatically resets itself, however if the motor has just about had it, the moment it is switched on, it just trips again.

The primary cause of motors overheating is that the filters are not cleaned or replaced frequently enough. Dont be fooled by Dyson's "lifetime filters". They need to be regularly cleaned and replaced when necessary.

Replacement motors are avaible on eBay for about £25, however repalcing one requires good DIY skills and tools.

Have a look at www.dysonmedic.com and see if you feel you can tackle it yourself. If not, take it to a repair shop or call the Dyson helpline.

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The priamry cause of motors overheating is that the filters are not cleaned or replaced frequently enough. Once a motor starts to overheat, it has already been damaged and even after the filters have been cleaned, may well still overheat and cut-out. The motor has a built in over-current trip to protect itself (and you if it seriously overheated). This normally automatically resets itself, however if the motor has just about had it, the moemnt it is switched on, it just trips again.

Replacement motors are avaible on eBay for about £25, however repalcing one requires good DIY skills and tools.

Have a look at www.dysonmedic.com and see if you feel you can tackle it yourself. If not, take it to a repair shop or call the Dyson helpline.

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1 Answer

Hoover upright has stopped working and tripped the circuit breaker. Where is the fuse located on the hoover ?


Most Hoover uprights do not have fuse. Some canisters doe but it is a thermal shutoff. When the vac overheats and cools down it restarts on its own.
You very likly have motor damage, but if lucky you could have an obstruction in the fan causing a jam. Do not attempt to run again.Lift the lid off the vac and see if the drive shaft for the belt will turn. If not motor will need to be removed and fan housing and intake area inspected. If the motor shaft turns and you hear scratching or clicking, the carbon brushes are likely damaged often requiring a replacement motor. If the fan is jammed you will need to dismantle the fan housing. Remove the two motor clamps and there will be four screws on the side of the housing to release the fan cover. The fan should rotate freely in your hand.

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Sounds more likely to be the switch than the motor, especially if it is the model with the top switch rather than the side "rocker" switch. If you are in the UK, speak to the technical people at www.a1cleaningsupplies.co.uk they can post a replacement. Otherwise outside or even within the UK you can contact the manufacturers technical people. Website is www.numatic.com

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My hoover mach 5 stopped during use and will now not turn on


If the machine overheats, a breaker trips. Most breakers reset themselves after they cool off. You may have a manual reset button to push on your model. The machine will overheat if the bag is too full, or if the exhaust port is clogged. The reset switch is usually on the back of the motor housing, near the footswitch.

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Did you check down by the brush roll for a clog in the dirt inlet. And is the brush roll turning freely, if it is being lugged down, it can cause the motor to overheat and the thermo protector will caught it off, until the motor cools down. But if both are ok, then maybe the motor protector needs to replaced, it is prematurely tripping.

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