Pipe knocking on dishwasher when taking water from cold fill

Yes the cold water pipe as the new models only have one supply. You connect the pipe to a cold water supply it then goes into the dishwasher and the machine heats the water up to the required temperature. Don't forget to fit the drain pipe into your waste pipe also to take the dirty water away.

It's your choice.There's only a single supply hose and with most dishwashers that means cold fill only, but as this is a compact basic worktop model the manual supplied suggests that users connect to a hot water supply.

In real-life situations though, the water drawn from the hot supply often isn't instantly hot so all you do is drain cold or tepid water from the supply pipe and let it get replaced with wasted hot water which then cools in the pipe! If the machine features condenser drying like many dishwashers, then cold water is essential for it to work. A final consideration is that unless your hot water is supplied at mains pressure (such as in a combi-boiler or megaflo system) then the water pressure from a hot water storage tank will not often be high enough and you'll have to use the cold supply.

If youve taken the fill hose off and checked for running water out of tap and its not coming through, your machine is ok, you have a water fault.the humming is the water valve working.

Hi,

Here is a tip that will help you to find out why water will not come into the dishwasher...

Dishwasher Trouble No Water entering Dishwasher

heatman101

NO IT SOUNDS LIKE A PLUMBING PROBLEM CALLED PIPE KNOCK THE MACHINE TAKES IN WATER FROM THE MAINS WHICH CAUSES THE PIPE TO MOVE TIE DOWN WHERE THE PIPE IS MOVING AND FIT A CLAMP

Could be something called water hammer which is a pipe issue. You can install/have installed a water hammer arrestor which is a small pipe extension that stops that.

most bosch have the inlet valve at the end of the fill pipe and it has an anti-flood device.
try turning off the water, take off the fill pipe then reconnect it and see if this works.
taking off the fill pipe resets the anti-flood device

just about ALL dishwashers only fill up with cold water (one pipe) the machine warms the water up etc, simple one to solve, just connect up so and use it, one cold water in, one waste pipe out

I am a recently retired appliance engineer of 20 years no that won't help, dishwashers only use one pipe cold water, check fill pipe for kink or low water flow rate filling up,if no problems then check heater element for open circuit, then check for any blockage with water outlet / filters and pump etc well somewhere to start to be going on with, if any of above helped rate me please,

That knocking noise is probably coming from your water line, and that happens when there is some kind of a ripple/wave effect when the water goes into your dishwasher (DW) thru the inlet/fill water valve. First turn your hot water valve off, underneath the sink coming from the wall and it usually is also going to your kitchen faucet. Then turn the electricity off by locating the breaker to the DW line and turning it off, or if it is plugged in an outlet under your sink, just unplug it. Then take the kick toe panel (panel with 2 or 4, 1/4" or philips screws) from the bottom of the dishwasher. You will then see the water hose, or could be a copper pipe, going into the valve (will have a selenoide, cylinder shape on top and have 2 wires plugged in to it). Unscrew the hose/pipe from the water valve and get a small wide bucket or pot and aim the hose/pipe to it. Slowly have someone open the water valve from under the sink while you hold it in the bucket/pot. If you hear the knocking again, you will need a plumber to check the pipes, hoses and water valve at your wall. If you don't here the knocking noise, just replace the dishwasher inlet/fill water valve part # 785330. http://www.repairclinic.com/0080.asp. Please post back.