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Hi, my kb403 pressure washer has very little pressure and motor runs constantly, any ideas what the problem could be?

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Posted on Jan 02, 2017

  • 389 Answers

SOURCE: Motor cuts on 2-3 seconds and then off and repeats this pattern

There are several possible causes of this problem. The three simplest to check are: 1. water supply is not sufficient, 2. water inlet strainer is clogged, 3. nozzle in the spray lance is partially blocked. After those, the most likely problems are internal and will probably require professional attention.

Posted on May 19, 2009

  • 5603 Answers

SOURCE: Hello there.My Karcher pressure washer motor

The valve that admits more water to be compressed is stuck. It is likely the O-Rings on it need replacing. No water to the pump, no pressure!

The motor will stop when pressure is up to the designed pressure.

Posted on Oct 03, 2009

  • 21 Answers

SOURCE: The pressure washer motor is

pour liquid TSP into the fresh water port (where the garden hose connects) and let it sit there for a couple of days.
This will clean all the calcium and lime deposits within the pump.
This is how I fixed my pressure problem.Hope it works for you.

Posted on Aug 29, 2010

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Have the hose pipe running into a bucket/container and use another short length of hose from the pressure washer to **** the water out of the bucket, that way if the bucket is full when you start, any drops in mains pressure wont affect the pressure washer as their should always be a reservoir or water to keep constant pressure.( you may need to prime the suction hose first, just hold the 2 hoses together in the bucket of water with pressure washer on)
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If this helps please rate me

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1 Answer

Hello there.My Karcher pressure washer motor constantly runs with no pressure coming out of trigger gun.I have tried another gun with the same result.The motor should stop/start when you press gun.The...


The valve that admits more water to be compressed is stuck. It is likely the O-Rings on it need replacing. No water to the pump, no pressure!

The motor will stop when pressure is up to the designed pressure.

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1 Answer

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