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Actuator seems to work but not correctly. When attached, the valve blocks the flow, but when the orkli motorized head is unclipped from the valve and the lever on the Sunvic valve to the hot tank was moved to manual setting, the water started to circulate. Possibly the wrong valve bought? Should...

Sorry for late response. Just back from work. I'll post a few images. As far as I can tell, the orkli is spring return. When I fitted it first, I could move the lever and it sprung back but now after I turned it 180 degrees, it moves freely without any resistance. Power seems to be getting to...

Hi oilhead. Thanks for the reply. The Sunvic that I removed has the number SZ 2301 and I notice that the orkli one has the number SZV2212 followed by 2-port motorized zone valve.

Hi. A couple of days ago I replaced the water pump and the motorised valve for the central heating. The pump is working fine but the motorised valve is not (Orkli RT-ZT) Heated water reaches the valve but not beyond, so the radiators are cold. I called the suppliers for advice and they said it...