Pressure Washer Thermal Relief Valve Stuck

The water is trapped in a loop which means fresh cool water cannot come in. 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.

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The thermal relief valve is usually preset to discharge water when it reaches 195 degrees.

Pressure washer thermal relief valve stuck.

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 pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open. One of them is a sticking unloader valve.

A defective pressure regulator can cause high pressure at the nozzle. If the unloader valve sticks shut outlet water pressure builds up until you trigger the spray wand or the pressure relief valve trips to release excess pressure. This just means that a thermal relief valve has been installed on your pump to prevent over heating. If the pressure washer doesn t develop adequate outlet pressure the unloader valve could be stuck open.

Thermal relief valves are a must have for pressure washers when the water is supplied by a garden type water hose. Until you pull the trigger your pressure washer is in by pass mode. As the co owner of an industrial cleaning and painting company jack simpson created the first simpson pressure washer in 1961. 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.

The new pressure washing technology gave jack s crew a clear advantage and they quickly became known for delivering higher quality work in a lot less time than their competition. Wait 5 minutes before using.