Combi Boiler - Bath runs cold

Joined
7 Apr 2008
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Location
Surrey
Country
United Kingdom
We got a new combi boiler less than 2 years ago.

The heating works fine, and the shower which is over the bath and from the same pipes as the bath is fine too

But recently if I run a bath it runs cold then hot then cold then hot - You end up with a luke warm bathfull at best.

I did notice one of the radiators gurgling like mad when I ran the bath, so I whacked the heating on and bled out a lot of air from it.

The problem still persists any idea what else I can try? And is it likely to be anything to do with the radiators? (need more bleeding?)

Thanks
 
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Rub the bath and stand by the boiler. See if the water is cycling on and off.
 
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Ok, as in firing up and then going off again? It should be constant the whole time its running I assume
 
Yes. And this isn't happening with any other hot tap?
 
It doesnt appear to be, and you can take a decent shower with no fluctuation in temperature at all.

I will try testing it all tonight, starting with the tap closest to the boiler.
 

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