Hi. Finally fixed the 3 port valve problem by swapping out the actuator head, so thanks everyone for your help but...
I now have a really annoying problem. When the pump kicks in for Central heating, it sometimes is quiet, but most times i get this noise http://freespace.virgin.net/david.roe/pump.mp3 (give it a second or two to start up!) which is like a vibrating noise coming from the pump.
Banging the pump works (occaisionally) although the noise sometimes returns.
the only thing i've done apart from change the valve actuator is turn the pump down to 2, as it is particularly noisy when on full speed.
Any ideas?
I now have a really annoying problem. When the pump kicks in for Central heating, it sometimes is quiet, but most times i get this noise http://freespace.virgin.net/david.roe/pump.mp3 (give it a second or two to start up!) which is like a vibrating noise coming from the pump.
Banging the pump works (occaisionally) although the noise sometimes returns.
the only thing i've done apart from change the valve actuator is turn the pump down to 2, as it is particularly noisy when on full speed.
Any ideas?