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I came across this post while looking for similar issues on my ST9420c My problems appear similar in nature, but the date code I get on the LCD is '2213' which if I understand some earlier posts correctly means it was made in 2013, week 22. Are there still ongoing problems so far as anyone...

I wondered if anyone else has had this problem? I don't use the DHW timer that much on my system as I have an immersion which heats more quickly for my needs. Sometimes, if I have the heating on anyway, I use the Hot Water channel on +1 or +2 and get hot water that way. Today I did that, and the...

I'm certainly no expert on how boilers work (condensing etc), so this is purely IMHO. To me the concept of modulating on / off seems valid but maybe not the best way of controlling the temp. Better is modulating the fuel in parallel. Even my wood pellet stove does this. If you think about it...

Just came across this post while looking into some problems I'm having with my boiler. In parallel, I'd contacted Honeywell who sent me a very nice FAQ document. It may be of use to some people here so have posted it in my album.

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