Triton hp combi

I recently changed the cartridge on a hp combi, because it dripped that stopped. But now when I flush the toilet. My shower streams out water. Are there check valves in the elbow? Should I of changed everything? Or can you think what else I could do to fix the issue? Check valves fitting? Thanks Olly
Asked 5 years ago by Oliver
There should be no correlation between the shower and the toilet system , even if the share the same cold water supply.
You maybe wise to call in a plumber.

Answered 5 years ago by Barrie Seabright

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