-Check whether the tap water supply is cut off or the water pressure is too low: turn on and off the water tap;

-Check whether the pump is normal: start and stop the pump;

-Check whether the orifice nozzle is normal: the water jet diverges obviously;

-Check whether there is oil leakage or water leakage in the peep hole after the baffle plate: there is water leakage, indicating that the dynamic seal of the high pressure chamber is damaged, and there is oil leakage, which indicates that the dynamic seal of the cylinder baffle plate is damaged;

-Check whether the water inlet check valve is invalid: the water inlet pipe has obvious water return;

-Check whether the water outlet check valve is invalid: the check valve feels hot;

-Check whether the high-pressure plunger is broken: remove the inlet and outlet pipes and the water outlet check valve, insert a thin steel wire into the high-pressure cylinder, probe the plunger, turn on the motor oil pump, and observe whether the steel wire is ejected. If the ejection is not detected or the moving distance is small, it indicates that the high-pressure plunger has broken.