Check the water pressure at the source and the flow connected to the inlet of the pressure washer. Troubleshooting your Coleman gas pressure washer when it produces weak sprayĪn insufficient water supply can cause low pressure at the nozzle. If the pressure relief valve purges constantly and doesn't close properly, replace it. Once the pump has cooled, the thermal relief valve closes and the pressure washer operates normally. When the thermal relief valve opens, cool water enters the pump and cools the system. If the pressure washer runs for more than 5 minutes when the spray wand isn't in use, the water in the pump often overheats, causing the thermal relief valve to open and discharge hot water onto the ground. What to do when water sprays out of the pressure relief valve on your Coleman gas pressure washer
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