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Shower hot then cold, but goes hot if basin tap is on

View the thread, titled "Shower hot then cold, but goes hot if basin tap is on" which is posted in UK Plumbers Forums on UK Plumbers Forums.

Hi
I have a 3way diverter shower, running off a combi boiler system. When having a shower hot then goes cold, but if I run the sink hot tap it then runs hot..
Any advice would be greatly appreciated.
Many thanks
 

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Ideal Logic Combi 30 boiler.
[automerge]1738347166[/automerge]

Sorry, can you expand a bit more please, many thanks

Think what last is trying to say if all the hot taps are working with no issue, then it could be the shower at fault
 

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