Red 'bag full' signal shows within minutes of first use when there's hardly anything in it. Why? Could there a filter that needs replacing somewhere? I think there are seven, though I can only find two.
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The red guard goes on top of the foam after it is installed. The purpose of the red guard is to keep the bag from sucking down against the filter when you get a few inches of dirt in the bottom of the bag. If it sucks down against the filter the dirt in the bag will cause an airlfow restriction even though the bag is not full.
The red light will also come on when there is a blockage in the pipes leading to the bag compartment. To test that the light is working correctly, you can unplug the flexible hose from the top of the bag compartment then switch the machine on. The red light should be off, but will come on if you block the hole with your hand. If that test shows the light is working, you need to search for a blockage - which is most likely to be in the flexible hose, but can be in the rigid plastic tube or in the base of the machine (turn it over and look in the little trap-door). Clearing a blockage from the hose can be difficult - you are more likely to be successful if you can devise a way to pull it out rather than trying to push it (as with a broom handle, for example), because pushing may just compact it. Good luck!
I would say that you have a slight clog in the hose or in the power nozzle somewhere. The full bag indicator is just a guage that will indicate full when it feels like it's lost suction. Example: If you were to take the hose and cover it with your hand, you'll notice that bag full indicator will show full.
To check and see where the clog in the vacuum is, remove the wands and floor attachment so you just have the hose on the vacuum cleaner. With just the hose attached, turn the vacuum cleaner on. Does it still show a full bag? If yes, then remove the hose completely from the vacuum cleaner so it's just the canister part by itself and turn on the vacuum again. If the bag full indicator is now showing an empty bag, this means that you have a clog in your hose.
If the bag full indicator displayed an empty bag when you had the hose on the vacuum, but shows a full bag when you have the wands and floor tool attached, this means that you have a clog in the vacuum either in the wands, or the floor attachment.
For removing clogs from the hose, the quickest way is to just purchase a plumbers snake at your local hardware store, and run the snake through the hose until you find the clog. You may also take a high pressure hose and spray it down the hose until the clog is cleared, but if you use a water hose, MAKE SURE the hose is 100% dry before you use it again.
Also that bag full indicator can be adjusted if you are getting a lot of suction power and it still shows full.
I hope that these suggestions helped you diagnosis your Miele canister to figure out why the indicator showed full. If this helped you please rate my repair helpful.
Feel free to contact me if you need further assitance, I'm always happy to help.
OK - blockages are not always obvious (especially if they are deep within the flexible hose). One thing you can try is to remove the flexible hose from the top of the bag compartment and then switch on - if the red light goes out, there's a blockage in the hose. If the light stays on, there's almost certainly a problem with the main circuit board (for which you should get professional help) but that would be extremely unusual. If you need further help, please post a reply here and I'll do what I can.
I suspect there is a blockage somewhere along the pipes leading to the dust bag.
The bag full or bag change indicator measures how strong a vacuum is present at or near to the point where the bag is connected to the pipes. Under normal conditions an empty bag poses little resistance to the air passing through and therefore causes only a slight vacuum. A full bag poses a lot of resistance and therefore causes a strong vacuum which in turn makes the indicator show time to change.
If, however, there is a blockage somewhere, regardless of the state of the bag, a strong vacuum develops which causes the indicator to show as if the bag is full.
The hot smell is proably a result of the motor having to work hard trying to overcome the blockage.
Try to look into all the pipes - you may need to do a bit of dismantling and/or strech out flexible pipes to do so - to see if there's anything stuck. Also try some (careful and gentle !) poking through the pipes with something like an un-ravelled wire coat hanger, but take great care when poking through the flexible pipes as these can be ripped and then you'll have a differnt problem !