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Thanks again Mick, one last question. Which actuators could I use. John

Hello Mick, daughter has complained that occasionally it doesn't fire up when it should. after a few weeks of complaints she decided it was usually on a Monday, the timing for Monday in the programmer was completely out, I set it up on Monday afternoon but she "thinks" it also happens at other...

Thanks Mick, more to think about. As I think I understand about the operation of the system, a signal to fire up the boiler and pump is fed to the boiler control board after the valve actuator has driven the valve to the correct position for the flow of hot water. On my own system which has...

Thanks for your reply Kev, I have searched every reference I can find to Sunvic products without success, forums are my only hope.

My daughters heating and hot water flow direction is controlled by what appears to be a Sunvic three way actuator marked <-DUOVAL-> on the cover. The nearest likeness I can find is marked <-DUOFLOW-> on the cover and the part number for this is SD2701. Are the DUOVAL and DUOFLOW different and...

Hi Bus, Going back about thirty years, I had a problem with an oil boiler which shut down after twenty minutes almost to the second. Called an engineer as I wasn't confident enough to look for myself. He proceeded to change just about everything changeable without success, eventually he removed...