Lately, my vacuum will only turn on when the accessory hose is hooked up. If I have the carpet brush attachment in place, the power will not turn on. I noticed that there are 2 switches that need to be pushed in in order for the vacuum to power on. A lower one for the agitator brush, and the upper one for hose attachment. If the upper one is pushed in, vacuum turns on, no issues, but nothing at all happens when the lower one is pushed in. I'm not sure if there's something other than just a bad switch that may be causing this.

I'm not aware of any "reset" button. If the vacuum does not turn on, it's usually due to one of the accessories not being installed properly.

From the manual:

"IF THE MOTOR DOES NOT RUN WHEN THE MOTOR ON-OFF SWITCH IS PUSHED:

1. Make sure the Power Cord is plugged into an outlet and that the outlet has power. (Check for a blown fuse, tripped circuit breaker or power company trouble.)

2. Make sure the cord plug is fully inserted into the unit.

3. Look for breaks in the Power Cord insulation. If the cord is damaged, get a new one. DO NOT ATTEMPT TO REPAIR IT. Use only a genuine Kirby® Power Cord. Do not use standard extension cords.

4. Make sure that an attachment or accessory is properly mounted on the front of the Power Plant. The unit will not run without the Power Nozzle , Hose Coupling, Air Intake Guard or Accessory Brush Nozzle in place.

5. The unit will not operate without either a Filtration Bag Assembly/ Mini Em-Tor® collector ?, Attachment Hose or Carpet Shampoo Tank properly installed on the Air Exhaust Port ?.

6. The Filtration Bag Assembly/Mini Em-Tor collector, Attachment Hose or Carpet Shampoo Tank must "click" firmly into place for the unit to operate. If the fitting is too tight and you have difficulty installing the above, apply a small drop of water to the gasket to reduce friction and ease installation.

Here's a link to the owner manual if you lost yours:
http://kirbywhq.powweb.com/manuals/se2/45B6BEDE315CBA7174350751ECA71E5D/LV-260012-E%20Domestic%20Manual.pdf

If you are unable to pick up water from the carpet after using the hose attachment, is is usually due to one of two reasons.
1 - The duct on the front of the dirty water tank has not been put back in place after using the hose. It is a square plastic piece about the size of a slice of sandwich bread.
2 - The lid is not properly seated on the tank. Be sure to hook the two tabs on the front edge in place before hooking the latch at the rear. This also applies when using the hose.

You gave a good start to giving us good information to help you with solving this problem-- But I need a little more information:

It sounds like you have the Electric Motor driven Power nozzle/ Floor attachment-- am I correct? (Not the type that has a little vacuum motor down at the floor attachment-- Not one that depends upon air flowing thru the unit to power the brush, -- am I correct?)

You can control the motor with a switch at the handle-- correct?

So here is the question: - when you say "the electric power brush -- goes to zero suction" -- what tells you that it 'went to zero suction'?-- the little red flag on the vacuum?-- or what?

I am suspecting something might be caught up in the floor wand-- or at the power nozzle itself-- or even in the flexible hose. Do you know how to take the hose off, and place the hand-held end, in the opening in the Miele Vacuum? Can you do that, and clear out the hose first-- and then the hose with the want connected?

If they are all clear-- we may need to open the floor plate on the floor nozzle, and check for something caught in the air passageway--

Tell us more

Mack B

To determine if you have a clog, first remove the attachment hose like you were going to put an attachment on. With the vacuum in the upright position, turn the vacuum on and place your hand over the hose. Do you feel a strong suction? If not remove the hose attachment by turning the locking ring at the end of the hose on the back of the vacuum counterclockwise, then remove the hose. Stretch the hose to it's fullest length several times. I would do this over some plastic or outside to keep the dust down.
Once you have done this replace the hose turning the locking ring clockwise to lock it in place, give the hose a little tug to make sure it's attached and locked.
Again, with the hose free from the agitator turn the vacuum on and fee for a good suction.
If you still don't have one then you likely have a plugged filter.
You will need to remove the dust bin.Once the dust bin is removed, over you trash can empty it by pressing the dustbin door release downwards. Now rotate the dustbin lid counterclockwise to remove the primary filter. With the lid removed grasp the filter and turn counterclockwise to remove the filter.

Pull the filter out over a trash can. Once out inspect it, if it's dirty you should wash the filter in warm water until the water is clear. When finish let the filter air dry for 24 hours before reinserting it.
Upon reinserting the filter, turn it clockwise to lock it in place, install the filter cover with a clockwise rotation to lock it in place and reinstall the dust bin.
Now plug the vacuum back in and again with the hose removed from the agitator or brush and ready to install an attachment then the vacuum on and you should have a solid suction.
These vacuums are really prone to poor suction if the filter get dirty. Because they have washable filters, you should take time about one a month to clean the filters.
Thanks Dorrian

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.

If there is sufficient suction at the end of the hose, the brushes should turn. Temporarily cover the rectangular opening that contacts the carpet/upholstery. This increases the suction to the air turbine, and may start it. The only other thing the user can do is to try to turn one of the brushes to assure the components rotate internally. It will not rotate easily.

There is a shampooer head with shampooer brushroll, water tank, small hose that hooks to the tank, collection tray

Need to use the Kirby shampoo. It goes down as wet suds but you pick up the suds with the vacuum when it drys. Fill tank adding 1 cap full of soap (kirby soap only) per level on the side, this attaches on the side where the bag is attached

After using the shampooer you need to reattach the vacuum bag and main brushroll nozzle as though you were just vacuuming up dirt.

Instructions:

Lift the front of your kirby up (front part with light) open the handle on the dail in the front (if epquipt), remove the power head, put on height adjustment on highest level, turn dial on front of power head until you see 2 red arrows facing each other, unlock by turning knob, power head should come right off, get shampooer out the power head for shampooer with collection tray, make sure dial is set red on red, put on front of Kirby and lock in, turn dial to green on green arrows, fill tank adding 1 cap full of soap (Kirby soap only) per level on the side, this attaches on the side where the bag is attached, line up arrow and notch and turn, to hook up hose put Kirby down to lowest level, notched end of hose hooks in on tray other end on the tank,on/off switch refers to the foam, Turn machine on to lay the foam & scrub carpet, take shampooer back off to extract the foam once it's dry.

Good luck.

You say it lost its suction, then you also say this is plenty of suction power, seems you cant figure out the prob. Try cleaning the fan on the suction blower. The blades can get chocked with dust which will give you a reduced suction.

when you install the hose connector it trips a switch that switches the vac motor into high speed because the vac path is longer using the hose. check the belt after you remove the front. make sure the direction of rotation is in the direction of belt travel stamped in the impeller. try adjusting the head height

Hi- Do you have a manual for the vacuum? My manual says to raise the headlight hood and then flip out the l-shaped handle on the belt lifter and turn it until the red arrows line up. Turn the accessory lock all the way to the left and the front should lift off. Then take the attachment hose and hook the two hooks over the bar and then push the hose up against the vacuum and lock into place by turning lever to the right. Does this help? Its kinda hard to explain without the pics.