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Also, could I ask if it is cross mixing why does that overheat the boiler? Thanks again Col

:) ok thanks. Should I do this check with the boiler on or off? As I don't want to run in dry if the cold is isolated? Cheers

Thanks very much for the reply. Let ne check i have this right. I isolated the cold feed under the boiler andcran a hot tap. Water does flow out! Should I check the shower mixer then? Cheers

Hi all After done help with a Combi boiler. We have had problems with it for a while. I have just replaced the diverter diaphragm as it was heating the rads when just the hot tap was on. The fault we have now is it's tripping out. It is fine on central heating. If is also ok if the hot...