Hope someone can answer this for me! I'm starting to learn some of the basics following a long saga that I won't go totally into! 
We have a Danfoss Randall HSA3 actuator on a 3 port mid position valve. Due to problems in the past of the hot water not heating, then boiler not lighting at all, we have already had the programmer replaced (now Centaurplus C27) and a new pcb in the boiler (Halstead Best 50). The latest problem in the long saga is that whenever the programmer calls for hot water, the system is also sending hot water through the rads. When this happens there is an audible ticking coming from the actuator. It doesn't matter whether the CH is switched on timer or off completely. No ticking if we switch CH on when HW is off.
We have already had the wiring checked by another sparky and have been told it is right. (however he now seems to have abandoned us!) Is it likely to be the motor itself in the actuator? If so, is it pretty easy to change it? I've had a quick peek and it is a screw on type, not riveted!
Cheers
We have a Danfoss Randall HSA3 actuator on a 3 port mid position valve. Due to problems in the past of the hot water not heating, then boiler not lighting at all, we have already had the programmer replaced (now Centaurplus C27) and a new pcb in the boiler (Halstead Best 50). The latest problem in the long saga is that whenever the programmer calls for hot water, the system is also sending hot water through the rads. When this happens there is an audible ticking coming from the actuator. It doesn't matter whether the CH is switched on timer or off completely. No ticking if we switch CH on when HW is off.
We have already had the wiring checked by another sparky and have been told it is right. (however he now seems to have abandoned us!) Is it likely to be the motor itself in the actuator? If so, is it pretty easy to change it? I've had a quick peek and it is a screw on type, not riveted!
Cheers
