I left my Karcher SC2 steam cleaner with trigger fixed ON (cleaning my bee kit) and it boiled dry. The heating element works (it gets hot and the steam valve disengages) but no steam comes out.

SOURCE: Bissell Pro Heat 2x steam cleaner, problems!

Must likely the brush motor is bad. The top cover has to come off to check it, this is where the tank sits on. Part # 2036757 and is #35 in the pix.

SOURCE: No steam

I used the straw to prime the lines and 50/50 mix of vinager and water and it worked perfectly. I then mixed the water container with the same mix and ran it through the system. All works fine now.

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: Bissell ProHeat Carpet Steam Cleaner stopped spraying.

The problem was a clogged heating unit which is located in the lower handle. There are two clear hoses going up the inside of the left leg of the lower handle that go to the heater and to the in-line water switch all within the lower handle. I unplugged the metal heating unit water lines and electrical connections (label the connections as you take them apart if you have a hard time remembering things...there were seven connection in all be it water and/or electrical). Removed the heat unit out and then removed the 6 screws holding the heater cover. Inside was a white powdery pasty debris (lime deposit ?) and the water path was clearly blocked in four different places. I cleansed the water trough with a little water and soft toothbrush and several toothpicks then reassembled. If you need new washers go to Orchard or ACE hardware. Take the old rubber washers(they are red) with you for comparison. I didn't need new washers...I just gently cleansed them. I immediately ran clear water through the machine and actually cleaned the carpet with a water rinse only. Will go back and finish the carpet the right way tomorrow. I had only used my machine three times before this happend over a three year period. A friend told me to always rinse it two maybe three times with clear water after using it and before storage. This took me exactly 42 minutes to disassembly and reassemble. Cost savings is several hundred dollars since I have a 5 bdrm house and would need a professional cleaner to do the small dirty traffic lanes all around the house.

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"