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Weird hot water issue

View the thread, titled "Weird hot water issue" which is posted in Bathroom Advice on UK Plumbers Forums.

Riley

Plumbers Arms member
Plumber
Gas Engineer
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Scratching my head a bit with this one. I don’t know if anybody has come across this before. Bath in a property has very basic nonceramic taps when she runs h & c, hot runs cold after about 10 mins. It’s off a combi boiler sonoy a lack of water. When she run just the hot tap it runs continuously hot.

Hope somebody might be able to offer a pearl
 
I did think mixer tap or shower but it’s so strange that it runs perfectly for 10 minutes and then goes cold but only when the cold bath tap is on. Boiler is a new Biasi combi ( not fitted by me I hasten to add). Flow belts out Of both the hot and cold taps And hot does need to be throttled back to achieve piping hot
 
Identical doesn’t drop off. If full open then easily 15/16 litres if throttled back to achieve piping hot then 10/11 litres at good temp
 
As I said mate when cold is off hot water tap runs constantly hot at a good temperature. It’s only when the cold tap is on the hot runs cold about 10minutes later
 
Stays alight it’s really bloody weird. The only recent change is the new bath taps but these really are nothing special contract variety
 
No I’m just trying to find a solution. It’s almost like there is a crossed pipe somewhere but all other outlets work fine
 
Are there any other thermostatic fittings in the property. I had an instance where a broken shower mixer was affecting flow in a similar way. Also check the rating of the boiler DHW flow rate as it may only be capable of raising it through 35dgC @ x flow and pressure. If either flow or pressure drop off the boiler may not be able to cope.
 

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