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Got a Vaillant ecoTec behaving strangely and I, as an "enthusiastic DIYer", can't pinpoint the problem. Boiler installed at the tail end of 2019, so still within warranty, so I've got a Vaillant warranty callout pencilled in for Thursday if needed... In short, boiler is taking 6-7 minutes to...

I've made a mistake and my plumber has gone off on holiday (a month!!!) after installing a new Vaillant ecoFIT pure. My mistake? I didn't get him the Nest in time before he disappeared off so it's down to me to wire it in. I've got a basic understanding of electrics and wiring, but not sure...