knocking

I have a glacier bay HL-40 shower valve that started acting up. (i assumed it was the valve) When I turn it from cold to hot it starts off fine and then at a certain point *clunk* it makes a clunk noise cutting off the flow of water and dribbling water out. I replaced the valve. Same issue...

Hello, while my water is running and for a time after I turn it off my pipes knock quite a lot (sometimes even just in the middle of the night). I'm wondering if it's the PRV because the downstream water pressure is set to 60 and will go to that after I turn the water off but will rise back to...

Starts at 40 seconds in: Navien tankless 240 Heat circulation on It's a new sound, we've had this tankless since 2016. Was inspected a year ago. When I look at which pipe is making the most vibrations, it's a black pipe on the right side of the unit. Should I turn the unit off immediately...

Hi, I'm curious if there are any experiences/insight beyond standard troubleshooting for this issue. The most practical resolutions i've seen so far are to straighten the fins (which i've done) and to ensure the return pipe is not resting on any metal hooks which could create noise... I do not...

Good evening, I recently moved into a new apartment (Built in 1999 but very well kept). The apartment has an Apollo based system. Since my girlfriend and I moved in the sound has occurred, that has been 10 days. It has been worse then what it is now. In the past ten days of narrowing down...