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The pin was quite stiff - i removed it and freed it up with some lubricant and it's moving well now.

Thanks for that Peter, I have removed the actuator from the valve and when the system is calling for central heating the actuator cam is constantly turning - is there some sort of latch that it's meant to make?

No faults at all when on d the system acts perfectly the diverter swithes to hot water and no changing over. when the room thermostat kicks in the display changes to c and that's when the diverter valve starts operating continually between the 2 positions, but the dispay shows c constantly -...

I have an Ideal Isar boiler - it's approx 4 years old and installed by the previous owner. I noticed the other day that when in central heating mode the diverter valve clicks constantly. In DHW mode this doesn't happen. On closer look the valve positioner is constantnly stoking open and...