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thanks for the advice, in particular regarding the room stat. i decided to get one and opened the junction box (LWC1) just to check the existing wiring first. i found that it wasn't quite in accordance with the instructions, nor was the pump wire in the boiler connected as its instructions said...

my house has a 12 year old system (i moved here just under 3 years ago). it consists of: potterton profile 80e boiler no roomstat (trvs on every radiator) fully pumped 2 motorised zone valves open vented storage tank with coil inside for hot water it basically works, but a few things...