Too much water coming out.
When you press the trigger an angled piece on the end of the plastic rod attached to the trigger pushes valve button in that then releases fluid. On releasing the trigger, the valve button is supposed to be pushed back out by an internal spring. The button gets sticky with evaporated cleaning fluid and does not come back out, causing fluid to continuously run. Try taking the machine outside, fill the tank with very hot water, pull the trigger, and let the clean, hot water flow through the valve. Perhaps it will free up. If not, the valvle will have to be replace. Either way, once it is working, ALWAYS flush the entire system with hot, clean, clear water to remove any cleaning solution in the system or it will only clog again
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