Bissell proheat 1699-y

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 know. Pump is bad.