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Karcher K 2.09 pressure is lower than it was. It still works but at a reduced pressure. What can cure this?

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  • 241 Answers

Clean any filters in the water supply line. Clean the tips in CLR to remove any crud buildup. If these action don't fix the problem, your pump seals have worn out. A VERY common problem on pressure washers. Needs professional repair.

Posted on Oct 15, 2013

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Posted on Jan 02, 2017

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  • 32 Answers

SOURCE: Karcher Motor Pulese On and Off

hi mark, you do have a problem with the lance.
you need to disconnect the lance and straighten a paper clip and insert down the nozzle end.
use the machine to wash the dirt in the nozzle backward down the lance.
Dirt only in nozzle end.
if still no good, purchase some nozzle cleaners and file out nozzle very slightly.

Posted on Jul 04, 2009

  • 569 Answers

SOURCE: Pressure hose not working on Karcher pressure washer

A common problem with these is a pressure valve inside the unit that controls the power to the pump. If the unit has not been used for some time the valve can stick.

Does the motor run when you press the trigger?

Please respond and I will advise further. (add a comment)

Posted on Apr 06, 2010

brado83
  • 106 Answers

SOURCE: my karcher pressure washer is switching on and off

unfortunately these little units have this problem commonly, 9 times out of 10 it will be the plastic head on the unit will be cracked and leaking slightly... it builds up pressure then leaks out and tries to build up the pressure again and this just reoccurs over and over...

you can get this repaired but is normally about half the cost of a new unit, if the pressure is still okay i would probably recommend just keep using it until it proper dies...

If you do get this fixed, we have studied into this and believe the main cause of heads cracking is warm water say if your inlet hose is in the sun for a period of time this can cause the water to become quite hot or if the unit sits and water trapped inside the head assy freezes can also cause this.

Posted on Sep 17, 2009

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My karcher seems to pulse when on, could this be due to the low water pressure from the hose?


I do not have specific experience of your machine.
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Pulsing (turning off) suggests that the outlet (high pressure) pipe is blocked or partially blocked. Try checking the nozzle and (with the unit turned off) clearing it with a fine piece of wire.
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Karcher Motor Pulese On and Off


hi mark, you do have a problem with the lance.
you need to disconnect the lance and straighten a paper clip and insert down the nozzle end.
use the machine to wash the dirt in the nozzle backward down the lance.
Dirt only in nozzle end.
if still no good, purchase some nozzle cleaners and file out nozzle very slightly.

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