Pressure Washer Thermal Relief Valve Stuck

If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open.

Pressure washer thermal relief valve stuck.

Seeing water spewing out of your pressure washer can be a distressing sight. Until you pull the trigger your pressure washer is in by. One of them is a sticking unloader valve. Wait 5 minutes before using.

This is referred to as a closed loop by pass. Thermal relief valves are a must have for pressure washers when the water is supplied by a garden type water hose. The thermal relief valve is usually preset to discharge water when it reaches 195 degrees. 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 your pressure washer is not building pressure and the engine is surging there could be a few different causes. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. 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. 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.

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