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Perfect! That got it working properly. The boiler is in the kitchen area of a fifth floor, East London flat so frost isn't a major consideration. I can't think why it would have been wired that way in the first place. Maybe it was to suit a previous resident who was used to an older style...

Here is a picture of the connections in the installer interface. Live, neutral and earth are correct. There is a bridge between the R and F terminals and there is a black wire also connected to the R terminal. There is also a grey wire that isn't connected to anything. None of the terminals to...

Would that be the connection at the installer interface box?

I have a Glow Worm Ultracom 30cxi boiler and Sunvic TLM room thermostat. I am trying to make the central heating operate according to the boiler's internal timer but it only seems able to be controlled by the thermostat. I set the CH to come on at a certain time but it doesn't, the only way to...