If the spray wand is unused for more than 5 minutes while the pump is running, the pressurized water heats up quickly. The thermal relief valve protects the pump from overheating.
If the pressure washer unloader valve isn’t working, replace it. Conversely, if the unloader valve won’t close, water pressure to the spray nozzle decreases drastically. If the unloader valve clogs or won’t open, the thermal release valve opens and sprays steamy water from the pump. When you let go of the trigger on the wand, the unloader valve opens to recirculate pressurized water to the Craftsman pressure washer pump, so the water won't overheat and damage the Craftsman power washer pump.
Most common Sears parts that need replacing on Craftsman power washers If the engine continues to run smoothly instead of bogging down after several minutes, then you'll likely need to replace the unloader valve. Start the engine and hold the wand trigger down so water flows freely out of the wand. Stop the engine and remove the nozzle from the tip of the wand. Try this test to see if a bad unloader is causing the engine to lose power. The engine bogs down when it struggles to run the pump. A failed unloader valve won't recirculate water back to the pump inlet, so pump outlet pressure builds up, making it harder for the engine to run the pump. If the engine starts and runs fine for several minutes but then loses power, the unloader valve may have failed.Replace the carburetor if it's too dirty to clean. If the carburetor is gummed up, the engine loses power, so check the carburetor and rebuild it if necessary.The engine also needs clean, fresh gasoline, so replace the fuel in the gas tank if the fuel is older than 3 months. The engine requires an adequate supply of clean air to run properly, so replace the air filter if it's dirty.
CRAFTSMAN POWER BROOM ATTACHMENT HOW TO
How to fix your Craftsman pressure washer when the engine loses power
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