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richardmartinJul 26, 2025
Why does my Kärcher 1800 Pressure Washer pressure fluctuate?
- JJacqueline LewisJul 26, 2025
If the output pressure of your Kärcher Pressure Washer varies high and low, several factors could be responsible. Start by ensuring you have enough inlet water supply by turning the water on full force and checking the garden hose for kinks, leaks, or blockages. Also, check that hoses and fittings are airtight to prevent the pump from sucking air; if it is, turn off the machine and purge the pump by squeezing the trigger gun until a steady flow of water emerges through the nozzle. Additionally, inspect the water inlet filter for clogs and rinse it out in warm water if needed. Clear any obstructions from the discharge nozzle, using a fine needle if necessary. Lastly, if the gun, hose, or spray wand are calcified, run distilled vinegar through the detergent suction tube.