Originally Posted by Plumber26
If it was the dishwasher, then why would the fauceet being turned on make the noise go away?
I didn't say it wasn't water hammer, what i said was that the dishwasher is obviously the cause of the problem. it goes away when you open the faucet b/c the shockwave has someplace to go, not just bouncing around in the pipes. a hammer arrestor might fix it for awhile, but the solenoid valve will continue to fail and eventually need to be fixed, so why put a bandaid on it?