Trevi boost shower issue ad overflow

[Riley]

Shower valve should have NRVs built in

 

[tatters40]

If you’re not going to read my posts I won’t bother helping any more.

I do read your posts, i have said i have looked for a non return valve and only found one on the cold supply, as its looks like the cold supply pushing the hot back (mains v gravity) i was hoping to solve the problem by finding a faulty valve on the hot side which is not there, the Trevi boost shower has no internal non return valve

 

[tatters40]

I do read your posts, i have said i have looked for a non return valve and only found one on the cold supply, as its looks like the cold supply pushing the hot back (mains v gravity) i was hoping to solve the problem by finding a faulty valve on the hot side which is not there, the Trevi boost shower has no internal non return valve

If there never was a non return valve on the hot i'm trying to understand why this issue has occurred, it may well need one but this issue has never been a problem in the past

 

[Ben-gee]

I refer you to the Sunday 4:22 post; to look for nrv inside the brass body of the shower valve.

 

[tatters40]

I refer you to the Sunday 4:22 post; to look for nrv inside the brass body of the shower valve.

And there isn't one hence reviving the post

 

[Ben-gee]

Ok . Well if there is no nrv and never has been and it used to work fine : the only thing I can think of is that there is an o- ring in the body of the valve that prevents the crossover of cold to hot which you are now experiencing. Is it possible this was misplaced/moved/ damaged not greased up when you replaced the cartridge?