Hi,
I have a Saunier Duval Thelia 23, the central heating is working fine,=20 however the hot water is not.=20
When in Central Heating & Hot Water mode, the HW is almost at mains temp, slightly above, when in HW only it is the same.=20 The HW temp control has no effect at all.
However putting it into HW mode and putting the CH temp=20 control to halfway, (usually is at 1/4)you get HW bouncing between=20 cold and hot and very hot radiators. The HW temp control has no effect in any mode. Using it in the unorthadox CH burning hot it makes a banging noise upon providing HW then gets cold then repeats.
Any ideas on how I can fix this, don't want to run the gambit of =A350 call out fee's, getting a =A3300 repair bill and all. After = installing a doubleglazed window for about 10% of the cost 3 quotes wanted i'm not in the mood for calling the professionals
Thanks for any advice