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Related issue: In general, if plain water is not run through the system (and drained out!) after each use, the water can leave "boiler scale" in small inlet and/or outlet tubes on the heater (up inside the handle). If it fills the inlet/outlet tube, this will stop ALL water flow, even if you're not using the 'heat' function, because the water goes through the heater whether the heater is on or off. I was able to get the flow going by digging out the corrosion from inside the inlet/outlet tubes on the heater where the clear, plastic, inlet and outlet hoses attach. It's been working fine for a few years since the fix.
I had the same problem and the heater ports were clogged. I took apart the top unit and cleaned the ports with miniature bottle brushes used to clean spray painting equipment (purchased at Harbor Freight for $4). Reassembled and the unit worked fine.
First thing, I check to see if water is coming out the attachment hose. If it is coming out the hose and not the bottom, most likely you have a clogged heater. The heater is located inside the lower handle and just needs to be taken apart and cleaned out. Fairly simple repair, and it is common.
If it sprays for just a few seconds when you first turn it on and then stops, that's a classic sign of a bad pump, and it will need to be replaced.
If it isn't pumping at all out of both the bottom or the hose, there a few simple things to check. Make sure there is fluid in both tanks. It will not work with one of the tanks empty. Make sure the flat belt isn't broken( there is an access panel on the side of the unit to ger to the belt). The flat belt runs the pump. Both of the tanks have a round rubber gasket that wraps around the valve and they tend to come off and get stuck in the inlet valve of the machine. It just needs to be put back on the tank.
There are numerous reasons why this machine might not pump, but these are a few of the most common ones.
Ran in to similar issue except mine would not spray soap or solution through the floor cleaner but would work through the upolstry cleaner.
I found that there were 2 problems as follows:
1) The heater was clogged with mineral deposits and old soap that I had not cleaned out on a previous use.
2) The Valve that attached to the trigger sticks. (I am currently looking for a new valve)
Since you have soap and no water I your problem probably exists in the bottom of the unit. There are 6 screws to take off the cover.
You will see a hose that come from the soap despenser. It leads to the pump which is located in the front left corner of the unit. You can also trace the water hosed in and out of this pump. Since the hoses are clear you should be able to see any clogg. There is a hose that leads up the handle to the valve and then a hose that comes back down the handle (through the wheel opening) The hose that comes back down from the handel leads to a splitter which devides the output to the two jets.
Take off the 2 long screws and remove the top part of the handle. Then from the back, just undr the hose and cord wrap asm, there are 2 screws set deep in the holes to remove. Don't remove the cord and hose wrap. Then lay the handle back, at the top, in the center, there is a catch to push in, then the top half will come off and you can get to the heater. Remove the hoses, one of the hose ports maybe clogged, clean them out, sometimes stuff in them gets pretty hard and hard to clean out.
After you may want to run a mix of vinegar and water thru the system to clean it all out.(not on your carpet tho)
The water comes out the hose at the same time. The diverter only diverts the suction from floor to attachment. If it is constantly spraying there is a problem with the attachment. Is it not spraying on the floor?