Question about Karcher PSI Electric Pressure Washer

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Power Washer lost pressure and is leaking through Pistol

I purchased my second Karchner Power Washer after my first lost pressure. The new one was used only once last Summer and is doing the same: Lost Pressure and is leaking through the Pistol, no detergent or anything was used ever in both of them.

What is the Problem and How to solve this Problem??

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 2 Answers

SOURCE: B302 - unable to start detergent flowing - How should it work?

It will only pick up detergent if you use a low pressure detergent nozzle - or no nozzle at all. It also takes a while for the detergent to get to the nozzle.

Posted on Nov 19, 2007

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  • 313 Answers

SOURCE: hooking up detergent to pressure washer

detergent can only be **** from the container only on low pressure.

Posted on Jul 08, 2008

  • 1 Answer

SOURCE: karcher k7.80 pressure washr

I have a Karcher K 3.86 M electric PW with a similar problem: water leaks from the pump near the outlet and the pressure surges on and off continuously at intervals of 1-2 seconds. The leak appears to be coming from a very thin crack in the plastic pump head in what I think is the "unloader" valve portion. I read elsewhere that if you leave water in these PW's and it freezes it will crack, causing leaks. I don't know how you can empty all the water out so I think we must store these PW's in areas that won't freeze in winter.

Posted on Jul 16, 2008

stug_57u
  • 99 Answers

SOURCE: No pressure in the pressure washer

Leaving the hose on shouldn't cause a problem so don't panic. It sounds like you could just have a dirty nozzle. Try sticking a pin or something in the end of the nozzle (machine not running) and giving it a clear out. also if it is a two peice gun, split it and tap the squirting part on something clean like a workbench to clear any debris that might have got in there.

Posted on Nov 01, 2008

  • 92 Answers

SOURCE: Karcher pressure washer won't start

Dear ralph_birtwi,
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.
So the control valve or even called spill valve, must be renewed.
Sometimes a little lubrication with the right type of silicon grease will get the control valve working again. This job is sometimes delicate and better done by a qualified technician.
Regards,
fulltech.

Posted on Apr 12, 2009

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