At present you can't control the temp off your dhw with hive, but its being looked at as we speak...also looking at upgrading the stat aswell....dan, the adverts brilliant m8😉😉
Yep you've cracked it mate, the combustion chamber cover is the bigger front panel that you've openly admitted to removing. Get someone out that knows what they're doing to check it out
STOP!...call a registered gas safe engineer out to check your boiler. Opening up the combustion chamber is illegal and dangerous unless you are qualified to do so.