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Sorry for essay in advance,
Don't know if pics will be of help. customer mentioned that her heating was coming on during the day when it wasn't timed to and she has been recieving high bills. System was installed by bg 7 years ago, symptoms started as 1rad in hallway being hot all the time, engineer came out and turned trv down on rad but this just caused the bathroom rad to get hot instead. Customer just put up with this but now a year down the line all the heating is coming on even when it is not timed to and with the room stat turned right down.
The system is a s plan, the motorised valve seems to be working, I can see the arm moving and hear the motor working when turning heating on and off. The motorised valve for the hot water arm moves also when cylinder stat turned up and down, but the arm doesn't seem to move quite as much as the heating one. The heating return looks like it is teed in after hot water return. I am thinking that hot water is programmed to come on during the day and then isn't turning off fully once heated so the heat begins to circulate around the heating via the heating return where it is teed in after cylinder return?
But wouldn't this of happened from when it was first installed? Anyone know what could be causing this? I am going to go back to do a proper inspection, what should I be testing?
I don't have lots of heating experience but am self employed so the only way of me learning is by taking on new jobs and doing lots of research and hep from you guys.
Boiler is a baxi system 100he
thanks for any help
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