faulty valve?

[hammers4spanner]

Had a shout out today to a no heating fault on a y plan system, custard has flushed the system himself recently and has updated room stat, 3 port and trvs as well. Have looked at it myself and hot water is no issue but 3 port wont allow any heating top go through ,there is no issue at wiring center and all seems wired correct . I have removed actuator and the spindle turns manually but upon replacing actuator the motor wont turn the spindle ,could this be a faulty actuator even tho its only weeks old??

 

[GrahamM]

Any similar issue I have had, it has always been a wiring and control compatibility issue. Try establish excactly what old controls were and go back to basics with wiring. Check the room stat is calling for heat.
It is possible the new actuator faulty, but unlikely.