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Hi, I have an oil fed Geminox FCX 30c boiler (https://www.manualslib.com/products/Geminox-Fcx-30-C-4112227.html) which has REG 103 (FBR1) ambient thermostat connected to it (as well as an external probe thermometer) The boiler has a mains power cable that plugs into socket in boiler room and...