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Recently moved into a newly built house running a Vaillent EcoTech Plus 618 boiler. Is it right that the only setting on here is to control the rad temperature - the left button doesn't have a tap icon above it to set HW temp as the manual says it should? There is a thermostat on the HW tank...

Late last week the street had a power cut and all the alarms went off. However, I couldn't get our strobe to stop flashing, even after pressing reset, setting and unsetting the alarm, or even doing an engineers strobe test. It just kept flashing although the rest of the alarm worked fine...