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Thanks for your advice , i checked the temps as you suggested and found the DHW stat was calling for the burner to fire when the temp on the lower pocket was around 84C, i found the DHW stat and adjusted it down , it now calls for the burner at 75-76C (tried it a few times and the temp varies...

Boilerman2 - Just re-reading your last post , silly question but where is the control stat? its not the user adjustable one on the front panel is it? (i thought this was just to adjust the heating temperture) thats what the label says). - thanks

Boilerman2 - Thanks for the info , i'll give this a go tonight and see how i get on , i'll let you know how it goes!

Boilerman2 - I have an electronic thermometer with various types of probes etc that i can borrow from work as i'm an electrical engineer at a hospital , i presume from your comments these temp set points are adjustable?? can you advise where ? , do i presume its a 'mechanical' adjustment on a...

Regarding the phials - heres a thing that i've always thought is odd , there is a phial sat exposed to the air in a sprung clip just above the expansion vessil , is this correct ? what is it sensing as all i can see it is sensing is the ambient air temperture inside the boiler door. ( is it...

Any advice on how to check the heat exchanger and clean it out? , i presume it needs to be removed and then flushed with some kind of cleaner ???

Certainly no performance issues with the DHW , its a constant good temperture when in use , its purely after it has been used that the problem arises , did it again this morning after my shower. Can you offer some guidance on how to check the resistance of the sensors please , i do have a...

Thanks for the replys , the manual states the following in method of opperation re. HW "When the hot tap is closed and the diverter valve flow switches sense that hot water is no longer required, if the timer switch is set to either TIMED or CONSTANT, the boiler will return to the central...

Hi All , My first post so please be gentle!. I have a Grant Combi mkII which has been giving me an over heating problem after using hot water recently , prime example is i have a shower in the morning before work hot water is fine , by the time i've dressed and come down stairs the boiler...