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problem showers from combi

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drainrod

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Worcester 35 CDI two different shower valves, I of which is brand new, both showers run hot for say 5mins then start to run cold for 3-4mins then hot then cold again, no taps being opened elsewhere in house
any help please?
 
Both showers run at the same time or individual?
 
Does the boiler stay alight or does it go out as well

Also is the kitchen hot tap doing the same ?
 
Hot and cold piped up correctly to the showers ?
 
Do you know if the filters were cleaned ?

Doesn't sound like a boiler issue as the hot tap is fine
 
Sounds like a bit of cross-flow from the cold supply to the hot water from combi.
Do you have any check valves on pipes to shower valves or non return valve on hot water out from combi?
cheers,
Andy
 
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