A high pressure cleaner is a machine that rushes a surface of a surface by using a power plant to generate high pressure water from a high pressure piston pump. There are several reasons for the pressure instability of the high pressure cleaner: 1. If the inlet valve is not tightly closed, it will cause leakage of high pressure water to the low pressure system (water supply system). Check whether the high pressure water outlet flow is reduced, whether the pressure is decreasing, and whether the water supply pipe is shaken. 2. If the drain valve is not tightly closed, it will cause high pressure washer to leak between several stuffing boxes. Check whether the high pressure water outlet flow is reduced, whether the pressure is decreasing, and whether the high pressure hose is shaken. 3. If the nozzle is worn, cracked or clogged, it will also cause flow change and pressure change, but there will be no phenomenon that the water supply hose or high pressure water pipe is s...