Pressure Washer Thermal Relief Valve Stuck

When the operator releases the trigger the pump s unloader diverts the water back to the inlet side of the pump.

Pressure washer thermal relief valve stuck.

This just means that a thermal relief valve has been installed on your pump to prevent over heating. Seeing water spewing out of your pressure washer can be a distressing sight. If the valve sticks in the closed position the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can t open to allow recirculation. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open.

Dirt caught in the spring or a stuck shaft are the most common issues solved by simply removing the unloader and cleaning looking for issues. If the valve sticks in the closed position the thermal relief valve frequently discharges hot water onto the ground because the unloader valve can t open to allow recirculation. Thermal relief valves are a must have for pressure washers when the water is supplied by a garden type water hose. This is referred to as a closed loop by pass.

One of them is a sticking unloader valve. Until you pull the trigger your pressure washer is in by. The thermal relief valve is usually preset to discharge water when it reaches 195 degrees. Wait 5 minutes before using.

If your pressure washer is not building pressure and the engine is surging there could be a few different causes.