Pressure Washer Thermal Relief Valve Stuck

As the co owner of an industrial cleaning and painting company jack simpson created the first simpson pressure washer in 1961. Wait 5 minutes before using. 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.

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Until you pull the trigger your pressure washer is in by pass mode.

Pressure washer thermal relief valve stuck.

The water is trapped in a loop which means fresh cool water cannot come in. 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. 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 thermal relief valve is usually preset to discharge water when it reaches 195 degrees. 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. A defective pressure regulator can cause high pressure at the nozzle. 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. If your pressure washer is not building pressure and the engine is surging there could be a few different causes. One of them is a sticking unloader valve. 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.