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Thanks for reply Wilhelm...As the actuator only makes a noise and gets hot in central heating mode, I assumed it wasn't the tank stat. I had tried moving temperature guage on tank a while ago and it seemed to stop boiler and pump correctly as I reduced the temperature. I'll try taking out the...

Yes I thought the valve might have been stiff so I operated the actuator not connected to the valve and saw that it turned correctly to each position but still made the buzzing once switched off at the thermostat and/or programmer. Valve also turned easily when moved with pliers - no strain at...

:cry: Thanks for your reply CH4. Have not been able to reply before now or even been able to look at the actuator etc. I have now looked at the link you suggested and it all made sense, so, as it really seemed to be the actuator that was playing up, this week I bought a new one. However it...

I have a myson 3 port diverter valve which almost works ok - it turns to central heating or hot water and central heating by motor. When central heating is turned off though the spring does not return the valve to the hot water only position UNTIL the fuse is switched off. If the central...