Cannot unscrew filler cap from steam cleaner SC 1.020

SOURCE: Problems with the Hoover Steam vac Heated carpet cleaner

This happens when the filter on the inside of the lid for the dirty water tank is pushed all of the way up. You need to leave a 1/4 in. gap from the top to the top of the filter.

SOURCE: hoover steam vac clean surge

The recovery tank lid isn't locked down all of the way around. The foam filter on the inside of the tank lid is up too far, needs at leasat a 1/4 in gap from the top. The filter screen by thye indicator is clogged. Some have a duct that sits in front of the recovery tank, either it isn't there or not pushed down all of the way.

SOURCE: Karcher SC 1502 steam cleaner can't get cap off water tank

Dear jrider784,
I solved a problem like this on FIXYA, just a few months ago. I gave this solution. Try to fill the machine from somewhere else. You can do this from the outlet. If you manage to do this, put on the machine. ( now you know that when there is hot water in the machine, the tap goes round free for safety). Now as the water starts to cool down....start trying to see if you can unscrew it. My plan is that with the hot water, the safety will start to work again. If the cap does not release the safety on cooling, then there is no other way but to destroy the cap and replace with a new one. Very important to mention that this job must be done by a qualified technician or some one who knows what he is doing. Working with hot water is very dangerous.
Regards,
Fulltech.

SOURCE: Steamer filler cap is sealed

You need a little more leverage--either a strap type tool or a pair of adjustable width pliers that span the width of the cap. Try running hot water over the cap first which may loosen it enough to remove by hand.

SOURCE: Bissell pro heat steam carpet cleaner, not releasing water.

That means that you need to replace the pump belt. Here is the belt you need and a manual you can view:

Bissell 7901 Belt and Manual

Testimonial: "just what I was looking for thank you"