Having problems with your KitchenAid 24 in. KUDP02CR Built-in Dishwasher ?

Kitchenaid Dishwasher makes jack hammer sound when filling

\015 My SS Kitchenaid (5 years old) makes jack hammer sound when filling with water. I suspect it is the water valve actuator assembly or an issue with our hot water on demand heater?\015

Answers :

Check the power to the valve actuator with a meter. If the power is not fluctuation (causing the valve to open and close quickly) then the problem is likely "water hammer" in the piping leading to the DW. Water hammer occurs when a fast flow of water turns a corner in the piping. The solution is too find where the pipe is vibrating and add support. Another way to eliminate water hammer is to install a shock tube on the pipe. It is filled with air and acts as a shock absorber when the water hammers. They are available at Home Depot, Lowes, plumbing supply places, etc. Another way to make a shock absorber is to install a tee in a horizontal part of the pipe with an 18 inch+ piece of pipe installed vertically and capped at the top. Air gets trapped in the vertical pipe and cushions the vibration. You might be able to do this in the space behind the DW before the pipe connects to the DW. The shock tube is smaller and does not have to be vertical so if space is an issue that may be the way to go.
This is a major exposure. When, exactly, does this sound happen? I suspect when the water turns OFF....
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\015\012typically this is water hammer and will eventually cause burst pipes. Install anti hammer. These are an air chamber installed in the pipe. there are hose style screw ins also, but harder to install.
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\015\012this is very important to resolve.
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\015\012Doc
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