Bristan Colonial Shower
Without seeing your system it is difficult to say what the problem is.
However two thoughts spring to mind.
They are not always fitted however on the valve inlets there should be check valves this stops the hot water entering the cold pipe and the cold water entering the hot pipe, if one of these check valves is stuck in the open position it could allow hot/cold mixing.
The other thought is if this wasn't a problem before then you could have a partial air lock in the hot supply pipe work.
Answered 4 years ago by George Thomson
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