Minds baffled by a shower on a quote

[tommy1712]

Evening lads, just got to look at a quote for a shower system not working properly,

hear goes

pupm was was replaced by someone else, the cold is fed correct from the tank (all be it in 15)
the hot is juts teed from the dhw feed.
The shower runs constantly cold but the cold supply pipes are hot so it is pumping hot when I shut the cold supply off the shower runs hot! I ballanced the cold so it was a usable temperature but the mixer would not adjust just stayed a constant temp.
Pump also over runs for 15-20 seconds after shower shut off.

I am am convinced the mixer has had it and the over run is caused by the incorrect installation.

any other ideas to throw in the mix? I recommend just ripping it all out and installing new corretly but that not gunna be cheep
so gunna start with replacement mixer and see how that goes

 

[tommy1712]

No isolators just a couple gate valves on the inlet side.
I think is gunna have to pop round tonight and basically tell her it's a complete new installation or I am not interested. the whole set up is a mess if I try to just fix one part it's still a crap installation and bound to still not work 100% and be nothing but a pain in my backside

 

[jldplumb]

I'd expect my customers to be able to use correct grammer and not write like a chav

Its grammar not grammer lol, just saying 😀

 

[AWheating]

one always spells and types as ones speaks. cor elp it.

i would install the pump to MI if not correct and then address any issues with the shower valve.

 

[REDSAW]

my grandma is bad aswell as being deeselectrik!.

dos the hat coming out the hat side, cole out of cole? isolate cole and trie thot!!

ad it befor were sum1 swaped em over an didnt wurk rightly.