I was using my Heritage 11 vacumn with the hose attachment and the motor shut down like the power went off .When you push the switch on the housing the light comes on but the motor does not run.

The part of the hose that attaches to the vacuum should push on the switch on the front of the vacuum so it won't come on without the nozzle or hose attached. Inspect the hose to see if that part may be broken or not making good contact to activate the switch,

the top part of the cage where the bag goes in has a tiny switch that goes down when the bag is in.Sometimes the cardboard top of the bag does not depress the switch.Check thast first.

check the top area of where the bag goes in.There is a tiny switch that get pushed down by the cardboard top of the bag.This is to protect the motor by not allowing the motor to engage without a bag

Remember that the motor will not run unless the vacuum head or hose are properly installed. If this is not the problem, the most likely problem is that the carbon brushes in the motor are badly worn and will need replacement. A less likely problem is that the front safety switch is out of adjustment. While the light is on, remove the head and push the metal rod on the switch next to the fan inward to see if this causes the motor to run.

Detach the hose at both ends. Drop a coin or marble down one end. If it rolls free, the hose is okay. If not, the hose is clogged. To clear it hold the wrong end of the hose to the tank and turn on. The reverse suction should clear the blockage. If not, try pushing it clear with a broom stick.
Check the power head where the hose attaches. Drop a coin down from the top. If it gets stuck, there's a blockage there. Try to clear it by pushing the handle of a wooden spoon or similar dull item down to push it clear.
Depending on the noise the vacuum is making, it's also possible some dust/debris got into the motor, causing problems.

Assuming the rug nozzle is currently attached, lift up the headlight hood. Twist the belt lifter (black plastic square) on the rug nozzle counterclockwise to remove the belt tension. Then pull the accessory lock up until the rug nozzle comes loose of the Power Plant. You will notice two hinges at the bottom that hook on the the Power Plant's attaching bar. Gently lift up the rug nozzle to unhook it from the attaching bar.

Now your Kirby is naked. You will notice two small hooks on the hose attachment--hook them over the attaching bar, place the end of the hose attachment firmly against the Power Plant, then push the accessory lock down to clamp the hose in place.

You are now ready to use your Kirby with the hose attachment.

These problems are nearly exclusively caused by a bad circut board and replacing it is the fix. Bad boards can cause many different effects so its nearly impossible to be sure. The 9v signal wire is not enough to short out an entire unit so it is unlikely the hose. If it is a direct connect system and you are pulling power from the 110 somehow that would cause main unit problems but that is unlikely at best. Sounds like a failed board to me.

Best of Luck

Hose plugged.
Thanks!!

Just got done fixing our Heritage II model 2HD, it had a dirty safety switch. Both the hose attachment and the roller housing depress a plunger to close the switch, thus sending AC to the motor brushes. You might want to try pushing this in and out repeatedly with your thumb, power removed of course, in an attempt to make better contact. If this works to restore power to the motor, it'll be just a short time before the problem repeats itself. You'll have to remove the switch to give it a thorough cleaning. I didn't have any contact cleaner handy, so I wound up using WD40. Hope this helps. Kevin H.

my guess with your kirby is the safety switch on the right side of your vacuum is not being pressed down, are you sure you have the right model of hose? any Heritage 1 2 or Legend 2 can work with it since they all have the same switch. your carpet head is working from the sound of it so either it's just that the high speed switch (being pressed fully down) doesn't work or you are not using the right type of hose (or the piece that engages the switch could be broken off