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Are you are sure the pump is running correctly (remove the bleed screw with a cloth underneath and put a small screwdriver inside to feel hear the impellors turning) as mentioned before try user control stat? Tricky one this.

If the pump is not running correctly you will still feel heat in the flow pipe (By the boiler) just not enough to take it away from the boiler and it will shut down on the temp stat.

If the pump wasn't working the OP would have no hot water armourer ...
 
The Hot water does extent to the radiators downstairs and the first floor if I keep repeating the domestic charge
 
If it was the pump, I think the Isar comes up with a fault code. I'm not sure how they work these Isar's, not really worked on them that much. But my little experience has told me they are shocking boilers!
 
If the pump wasn't working the OP would have no hot water armourer ...

I was thinking not working efficiently. eg. broken impeller blade so enough to get it through the plate heat ex but not away from the boiler
 
Hi Guys'

Reporting back with a success, the problem with the boiler was a faulty user control unit, up and running now, thanks guys for your addvice and especially to Diamondgas Top Man.
 
arran197 wrote, Ideal cheap tat! Lol!

Sorry you feel that way mate, my occupation is an electrician working UK and worldwide and I like to think that I have given the same dedication to small projects as I have given to vastly huge project.

I do work with state of the art materials and installations, but when confronted with cost cut installations and low maintenance levels I have to give the same dedication to these as the costly ones.

Oh the boiler is my Mums, my late Dad had it fitted in 2008, I never considered him any other than a generous man

I repeat again, thak you all for the tecnical information and knolege you freely gave me, Cheers
 

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