1. Check whether the motor starts normally. If impure oil is injected into the high-pressure pump, please drain the oil in the pump first, and then inject the special oil for the high-pressure pump;
2. Check whether the hose, filter and nozzle are kinked, bent or damaged;
3. Check whether the cleaning fluid nozzle is connected to the spray gun, confirm whether the machine runs for more than 3 minutes with the spray gun closed, and check whether the nozzle is excessively worn. If the internal failure of the high-pressure pump occurs, the wearing parts are worn out, and the water flow is reduced; the pipes inside the equipment are blocked, and the water flow is too small, resulting in too low working pressure.