I have a SIMONIZ S2000 electric. I bought the unit about 8 weeks ago used it once. On the second use yesterday the unit didn't work as well, the pressure seemed only a bit better than hose pressure and soap did not dispense at any pressure. SO.... after much thought I turned the hose/tap pressure down so that I only got about 2-3 GPM instead of the typical 5-6GPM normally coming out of my hose....... it worked! Soap dispenses and spay is way better! It seems that if if the inlet hose pressure is high the pump doesn't work as well... go figure.
SOURCE: Where is the pressure switch located on a simoniz
There is a pressure switch to cut the motor once target pressure is reached. I.e. when the nozzle is closed. It's a black cheap plastic thing, right in front of the pump body. It has a white plastic lever to trip the switch. It was sticking intermittently on mine. the simoniz 1600 is quite a cheap peace of ****, needs fiddling around every time I use it
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