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Karcher pressure washer?

My Karcher pressure washer no longer gives a constant pressure. It gives intermittent bursts every half second or so. Any ideas ?
John Duggan, October 2009
Thanks for your advice Malcolm

John, March 2010
What model do you have?

check the end of the lance for a blockage,

check that your water hose is fully turned on,

check that you are NOT using hoselock couplings that stop the water when disconected,

www.aquaspray.co.uk

Malcolm, January 2010
Thanks for the advice Gazz. Haven't used it for a few weeks, but when I do next I'll try that. John.

John, December 2009
Hi
Sounds like a air block, connect the hose turn the tap on and pull the trigger, at this point dont turn it on.
When the water is running smooth out the nozel plug it in and turn it on.
give it a try, all the best.

gazz, November 2009
Thanks for your answer. I'll try that first, and if it doesn't work, then plan B. Trouble is, I don't have a plan B !!! John.

John, October 2009
Mine was the same and I found the fault was dirt in the lance head - cleaned out by backflushing lance wit hose ( lance disconnected from unit ) and worked ok BUT my mate has one that did the same and it was the pump - Replacement was prohibitive so he insured his car with Tesco and got a new washer free - lucky sod

pc6493, October 2009
link Click here to see other fixes for Karcher.