Saunier Duval F30E luke wrm hot water with heating on?
My hot water has got progresivly colder when my heating is on.have adjusted heat control to max but has made no difference.Have had the sytem flushed too. Any ideas please.
have you had your secondary heat exchanger cleaned out? most likely cause is blocked heat exchanger or dirt behind divertor valve, other than that a sensor fault, but by the sounds of it i would go for the dirty heat exchanger, not a long job on a thema, once it is out it will need a chemical clean to remove all the iron oxide, should cost you 60 to 70, would be an idea to get a magna clean fitted to prevent repeat problems
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