Bissell Powerwash Proheat, flow indicator

Is it spraying? Is so, maybe the cap for the indictor can be too tight, or loose, maybe be bad and allowing an air leak. The white filter under the indictor may need to be cleaned. If no spray:
Does water squirt out of the hose nozzle, if it does, then check the heater inside the handle asm. Make sure that where the tubes hook up to it are not clogged. If water doesn't squirt, check for the seal at the bottom of the tank, it needs to be on the tank, not in the hole. The flow indictor cap is leaking air or maybe is too tight. If you had the top cover off, make sure that the tubes are routed right so as not to get pinched when the cover is put back on, the smart mix knob should be in the water setting and that the piston is on the bottom of the smart mix knob. Pump is bad. Try running a mix of vinegar and mater thru it to see if it will unclog it.