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You've probably tried all this but humor me, check the plug to make sure it's not loose, make sure the terminals at least feel like they're tight and still connected, the walk down the cord (unplugged), hand over hand to make sure there aren't any bulges or shallow feeling spots showing a problem in the wiring.
I would guess there is a fair amount of problems with the foot switch, but I don't know this, after plugging back in, slap the switch with your hand vigorously a few times, if corrosion or a fault is present, this might wake it up, at least give you an idea of where to head next if it tries to run.
Check the cord first to make sure you are getting power to the switch. If not replace the cord, if so test the switch to make sure you are getting power through the switch. If still not solved follow the power down to the motor and make sure you're getting power to the motor. If so and still wont' run test the motor.
Mine did the same thing. The electrical cord is loose where it plugs into the machine. When you pull the vacuum into the room it puts just enough strain on the cord to break the electrical connection. Push the plug on the cord firmly into the vacuum.
Try moving the cord around at the strain relief, where cord enters the vac, as internal wires may have broken.
Check brushes of electric motor, they may be worn down.
Check main switch continuity with a meter on ohms or buzzer.
But there could be a thermal fuse either in or on the motor, to avoid overheating damage and smoke signals!
I called Dyson because I had a similar problem. When I pushed the red button down on my dc25, but it would not stay down. The vacuum would turn on when the button was pushed down, but of course when I let go of it the vacuum would shut off. The helpful telephone tech. Recognized the symptom right away and told me to push down on the button fully and let It flick up like a lighter. I about fell off my chair when that worked right away! Anyways for what it's worth, she said sometimes the mechanism in the buttons gets consnarlitated (my tern, not hers!) and this resets the spring.
If by fan you mean motor then it could be a simple fix. First, has the filter been changed or cleaned recently. And second, is there a clog of debris in the house or passage way leading to the bag or canister? Many vacuums are now equipped with a thermal switch that interrupts power to the motor. This helps prevent heat damage to the motor as well as reduce the potential for a fire. Often, after checking for clogs and doing simple routine maintenance/ cleaning, it is simply a matter of allowing the vac to cool. If after 10 or 15 minutes, the vac still does not work, then start at the power cord plug and work your way to the motor. Be sure the vacuum is not plugged in when inspecting the power cord. Look for damage to the cable. A cut or deep abrasion may be enough to short the circuit. If this has happened, likely a breaker associated with the outlet you plugged the vac into has tripped. If you know the outlets good, and the power cord looks to be in working condition, the next potential culprit is the power switch. These can very greatly , depending on the make and model. Typically, you can feel that the switch is loose or that it is hard to switch on and off. These qualies could indicate a broken switch. If the switch seems good, perhaps the motor has failed. Most later model vac motors are not easily serviceable, and are otherwise very cheap to replace. The average household vacuum retail for about $60. So if you have been using the same vac for a coupl of years, you have likely gotten your moneysworth. Good luck!
It could be the switch that has become defective (the 'feel' of the switch may be different, but needs to be checked with a meter). Another possibility is that the cord has developed a loose connection at or near the power plug. Turn the switch on and wiggle/push the cord near the plug. An intermittent connection is indicated by the motor turning on and off. If so, cut the plug from the cord (they are usually a molded device that can't be serviced) and install a replacement plug from a hardware store or home center. If the switch is determined to be bad, order a new one from an appliance parts store or vacuum repair center. Good luck!
The easy answer to this problem is you need a new cord. Any fit all 20 to 35 foot two wire cord will work. However, you will need to take disassemble the almost the entire vacuum to test the current cord to see if it is bad. There are a lot of pieces to take off to get to the inside of the vacuum where the cord enters from the back. You could also have a bad motor.
Reason number 1 (not sure why Kirby Co. still has not fixed it) - improperly installed outer bag. You have to push the bag all the way to the unit so it presses the safety switch that is between exhaust and the vacuum shell
Reason 2 - defective cord - try wiggling it. If you know how to do it - try removing cord and supplying power directly to the unit using another cord or wire (ONLY if you know how to work with electricity.If you get zapped - do not blame me)
Reason 3 - bad power switch (instructions on how to replace it HERE)