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Thanks for replying so quick .I would like to asure myself it is wired correct, as the previous person who fixed it obviously did not and may well have mooved wires telboy

I have a Potterton Prima b balanced flue pumped system with a British gas program timer emp2, I wish to fit a wired frost thermostate. IT already has one but I think it is wired wrong because when the timer turns off their is no constant live at any side of the honeywell froststate or boiler...