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It’s Out of Battery.
For flat or round belts, the tension required may require you to use a screwdriver to pry the end of the belt into the correct position..Your New Belt Will (Probably) Look Too Small.

Depending on the type of belt your vacuum uses, the new one may look or feel too small.This is partly because the old belt will have stretched during use, but also because many vacuum belts are held in place through tension..Even so, it’s a good idea to double check that the belt is the correct part for your vacuum’s model if you’re not sure that it fits.. Stretching is most common on flat or round vacuum belts.

It’s less common on other types, such as geared (cogged) belts..Step 5: Replace the Base Plate.

Once the brushroll is fitted, double check that everything looks correct by comparing it with the photos you took earlier.
You can also try manually spinning the motor shaft to check that the belt is driving the brush roll.. You can then replace the base plate and any other components that needed to be removed to access the brush roll..If the vacuum has string or hair tangled around the brush roll, you can usually cut this away with scissors.
Larger blockages at the air inlet may require you to remove the baseplate – check your manual for how to do this.. Make sure that the floorhead is properly reassembled before using it, as this can be another source of errors..A red light may also be caused by a broken vacuum cleaner belt.
The belt drives the brush roll, so a broken belt will prevent it from turning.Fortunately, it’s usually straightforward to replace a vacuum belt..