Hi All, looking for a bit of advice. I've just moved in to a new house a few weeks ago and have noticed that the central heating is coming when only the hot water is called. I only noticed this a few days ago after we had the hot weather, since I had the heating turned off but hot water still on - I have an older honeywell programmer that can only schedule heating and hot water to be called at the same time. I initially thought the issue could be with the motorised valve, as it seems to be stuck in an open position (there is no resistance at all on the manual lever, and I can feel the pipes heat up to both A and B feeds after hot water is called) - I replaced the actuator however there still seems to be issues. I've now noticed that the boiler doesn't even fire up when just central heating is called, and still have heating and hot water when just the hot water is called. My next thought is that this could be a wiring issue? Any advice would be appreciated.