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Hi Agile, Thanks for your reply. Yes, I believe the boiler does have such a heat exchanger. The manual calls it a 'double parallel heat exchanger'. How would I go about proving that the HE is blocked? Are there any simple fixes such as putting some chemicals into the CH side? Or do I...

Hi Gareth, Yeah, I forgot to add that I've read pretty much every Ravenheat thread going. I'm still searching and re-reading them though! :) It sounds like I have the same HW problem you had (my flue is OK, though!). I've measured the voltage across the CH and DHW thermistors and it...

Hi all, I've got a Ravenheat RSF84ET combination boiler. It was installed by the previous owner of the house (I've been in 2.5 years). For the first year I used it, the boiler worked great, but since then the DHW has been on the blink. The CH works perfectly. If I open a hot tap, the...