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Thanks for a quick reply seco services, So the actuator stays in the last commanded position, wasn't sure is it was sprung return to H. I'll take a look for the markings on the valve body. Cheers!

Some advice if possible. Moved into this property a couple of months ago. Central Heading: Glowworm Hideaway 60B, Landis & Gyr RWB2 controller BGMVSP-23 port, unknown pump and hall thermostat. I think the boiler was installed in 1999. Not sure of other components. Never really...