Motorised Valve Actuator- Danfoss HSA3

[selector007]

I have a potterton boiler(not combi). When i select hot water from the programmer all is fine the boiler fires up but when i select CH on its own the boiler doesn't fire up.

When I select CH on its own i can hear a clicking noise coming from the Motorised Valve Actuator as if it is getting stuck. I have checked the thermostat and this seems to be okay as i can hear a click when i turn the temperature up.

If i select HW and CH together and pull the lever on the actuator over to manual the CH does warm up. Am I right to assume i need a new Motorised Valve Actuator (just the white box bit?), and if yes is this easy to fit?

 

[seco services]

when you select heating only has the lever still got resistance on it ?
is the valve constantly clicking when heating selected ?

 

[selector007]

Yes the valve does have resistance and constantly clicks

 

[seco services]

sounds like the motor is jumping on the ratchet and so not opening the valve.
you can buy just the actuator

 

[selector007]

Thanks. Is the actuator the white box, is it easy enough to wire up?

 

[seco services]

yes it has two screws opersite corners that remove the actuator.
yes only five wires in your wiring centre box remove and replace one at a time then you can't go wrong.
isolate the power first.

 

[selector007]

Thanks a lot! Muchly appreciated!