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Thank you stardanny for your helpful reply, I shall attempt the filling loop replacement and see if that solves the issue Failing that I shall get a heating engineer to come and look at the pressure vessel as it was only fitted a couple of years ago and if I remember correctly the boiler has...

It's a Worcester boss green star 12i I can here the honeywell actuator kick in and it switches the boiler on and off and the sunvic valve also switches the hot water on and off. How can I check if a paddle is stuck? Do the 2 port valves effect the boiler pressure?

I'm a bit confused, the actuators would only go on one way, and matched exactly to the ones I took off, I also swapped the wires like for like and one by one. They don't have batteries in either You have completely confused me

Dear all I am hoping someone could shed some light on an issue I am having with my heating system, I had to replace 2, 2 port motorised valves 1 was a honeywell (controls central heating) the other a sunvic. this was due to the boiler remaining on and the only way to stop it was to switch off...