Hi there, I have an excellent Electrolux (but older) Diplomat LX model which stops when the bag is supposedly full. It''s not full however, but merely 1/4 to 1/3 full. I'd like to reduce the "sensitivity" of the sensor or turn it off altogether. I don't run my vacuum with a full bag, but there's a limit. Please tell me how to address this problem. Thanks very much. Pierre

SOURCE: Electrolux model LX vacuum- Problem, ejects empty

The vacuum is doing exactly what it is suppossed to do, on this model, the bag will eject when the suction is reduced due to the pores in the bag becoming clogged by dirt, dust, or fine powder. Try a NEW bag, and **** up less superfine dust such as baby powder or plaster dust that immediately clog the bag. Next, on later model LX's on the bottom of the canister near the bag door is a dial, setting the dial to a higher number will reduce the sensitivity of this automatic bag ejection operation and will allow the vacuum to continue to run until the bag is even more clogged, however, running the vacuum with a fully clogged bag causes the motor to overheat and reduces suction and damages the vacuum. If you have an early model LX, there may have been a "basement and attic" key mounted to the bottom, but often are lost by now and it is used to make such an adjustment. The 1952 model LX was the first with the diaphram automatic bag ejection system and the problem of the bag ejecting too soon was common. An improvement on the model LXI added the control dial with numbers 1 to 6 on it to adjust the sensitivity. I am looking up more info on adjusting a model without the dial because I just picked one up at an estate sale a few days ago and I've heard (some time ago) that the early ones with no dial had a "basement and attic" key that snapped to the bottom of the cleaner to make this adjustment, not sure where it is though and the one I have does not seem to have the key. Will let you know more if I find it! Thanks, I am an Electrolux fan and will use nothing else because I have used so many vacuums but love the convenience of Electrolux design and durability. They have been in my family since my grandparents came to America and are simply the best in my opinion.

SOURCE: I have an Electrolux Diplomat vacuum and I changed

Although the "?" light is primarily for indicating the bag is full, it can also come on as a result of other problems. First, turn dial on top of vacuum counter-clockwise so the smallest dot lines up with the arrow. See if it stays on. If not, detach hose and turn vacuum on. Place palm of hand over intake. If it turns off, it's possible that the tubes connecting to the CVA are clogged and simply need cleaned. This is most often caused by using "made to fit" Electrolux bags. Dust is sucked through the bags and into the motor compartment of the machine. All interior parts get covered in dust and need to be cleaned. If this is the cause, the vacuum is best cleaned and repaired at an authorized Aerus Electrolux store. If the vacuum shuts off, or won't turn on before placing hand over the intake, it's probable the control valve assembly is bad and needs replaced.
Another cause is an overheated motor due to clogged screen at back of bag well, full or clogged bag, dirty afterfilter, bad wiring/connections, clogged hose, clogged power head, or bad motor. It depends largely on the type and model of cleaner. Clogged wands are also a possibility, but unlikely.

Check and clean screen at back of bag well.

Replace bag. Make sure it's a genuine Electrolux bag made by Home Solutions.

Check and replace afterfilter if necessary. These should be replaced after every six bags.

Broken and worn wiring connections are often found in the hose ends due to abuse and normal wear and tear. You can check the continuity of the hose using a continuity tester or multi-tester. If a multi-tester, turn dial to one of the Ohm settings. Place one probe into one of the terminals on the end of the hose. This will be referred to as T1. Touch the other probe to each of the terminals/connections on the other end of the hose. These will be T3 and T4. One of them should read zero, the other should read infinity. Repeat this with the other terminal, which will be T2.

Drop a marble in one end of hose and let it roll through. If it doesn't roll through, the hose is clogged and needs to be cleared. Plug hose into the exhaust port of the vacuum, place other end in the in port. Turn vacuum on. This provides a blowing and sucking action which should clear the hose.
Detach hose from power nozzle (PN). Drop a marble into the wand end of PN. If it rolls through, it's clear. If not, there's probably a clog behind the brush where the intake opening is. You may be able to reach this through wand end with needle nose pliers, or either end with a knitting/crochet needle or a bent coat hanger.

If none of these "fixes" provide the answer to the problem, it should be taken to the nearest Aerus Electrolux store for diagnosis. Repairs or checks involving disassembly of the vacuum should always be done by an authorized Aerus Electrolux service technician.

The store nearest you can be found by following the instructions at the below listed link:
http://www.aerushome.com/storelocator/