Clunking actuator

22 Jan 2011
Reaction score
West Glamorgan
United Kingdom
When the central heating is turned on there is a loud clunking sound coming from the actuator. The radiators are still hot and the water is also fine, was hoping someone could shed some light on the problem and is it an easy problem to resolve.
Sponsored Links
It is a siemens demountable actuator DVA3 230v 50 hz 3 amp midposition cmv 322. The noise only starts when the heating is warm. If we isolate the supply from the main switch it stops, we put the main switch back on, no noise, click the heating on how ever and it starts again.
you may find it will be the paddle in the valve itself, had this on honeywells before, speed of the water moving slams the paddle shut instead of the valve moving at a slow speed, this normally makes a noise when you turn heating/hotwater on and off, all you can do is replace the complete/ 3-port or zone valve whichever it is.
Sponsored Links

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local