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Electric modelm620 karcher does not start

The green light appears when on switch pressed ,power is there, the machine will not start.

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The bypass valve is most likley jammed. Remove the cover from the machine, then remove the chemical tank. Unscrew the micro switch cover and manually operate the micro switch. If the motor runs the bypass valve is faulty. Replace the valve along with the stem seals on the valve.

Posted on Mar 06, 2009

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Posted on Jan 02, 2017

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Most pressure washers when their gun is released, the machine stops automaticaly. This is done ny means of a control valve. When the gun is closed...pressure is built and the control valve moves and switches a micro switch off. In your case the micro switch is still closed in off position. Now this happens if a machine is left and stored with pressure in it., This control valve could get jammed and leaving the micro switch in off position. It could also stay in off position by sticking, due to incorrect chemical.
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