No Pressure
Kärcher Pressure Washer
Severity: ModerateWhat Does This Error Mean?
No pressure on a Karcher is almost always caused by a blocked nozzle, an air lock in the pump, or a kinked inlet hose. Check the nozzle and inlet hose before anything else.
How to Fix It
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Check the inlet water supply
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Check the inlet hose for kinks
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Clear the spray nozzle
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Purge air from the pump
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Check the filter in the inlet connector
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Check the water pressure from the tap
Frequently Asked Questions
Why does my Karcher pressure washer pulse or surge instead of holding steady pressure?
Pulsing pressure is usually caused by a partially blocked nozzle or a small air leak at the inlet connection. Tighten the inlet hose connection and clean the nozzle.
My Karcher runs but the jet is very weak — is the pump failing?
A worn pump seal can cause pressure loss, but check the nozzle, inlet filter, and hose flow rate first. These simple causes are far more common than pump failure on domestic models.
How do I descale a Karcher pressure washer nozzle?
Soak the nozzle in a citric acid descaler solution for 30 minutes. Rinse thoroughly. You can also use the cleaning needle stored in the quick-connect nozzle housing to manually clear the orifice.