Question about Karcher K2.26 Electric Power Washer

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Motor runs constantly with low pressure.

Unti is out of warranty and from the manual lists part no. 1.423-954.0

Immediately when plugged in to power and after the ''RESET'' on GFCI is pressed the motor turns on. This is regardless of the power switch being ''OFF'' or ''ON'' on the side of the unit OR regardless if the gun trigger is being pulled. When the power switch is ''ON'' and trigger is pulled, the pressure from the nozzle is less than 50% of normal.
I remember the unit wouldn't make a noise until the switch was turned to ON. And only then, it would run a very quick pressurizing cycle and then shut off until the trigger was pressed.

I found a 90850340 K-Switch from an online parts store but not sure if this is the cause of the issue or not. I have completely taken off the housing and taken a look into the electrical housing box but I'm at a loss for what the crux of the issue is. Please help!

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What you described I would think that it a switch problem, I would go to and order an original part for this and start over with the electrical portion and then go from there.

Posted on Jan 23, 2009

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