Hi
I have a zone value actuator that will not stay in the open position. With the heating "on" the actuator tries to open the valve, but when open it immediately snaps back to the closed position. I've taken the actuator off the valve and it continues to do this.
I looked at the bottom of the actuator with the heating on, and I can see the motor turning the "key", but I cannot see any reason why it should suddenly snap back shut.
My temporary solution has been to remove the actuator and manually turn the valve to the open position. I suspect this is not very efficient, but at least it heats the house.
What I am trying to get a feel for is whether the behaviour of the actuator is symptomatic of a problem elsewhere in the system, or whether it is symptomatic of a broken actuator. If the latter, it seems a relatively simple job to fix.
There is a second value in the system - I assume this is the HW feed, and this seems to work fine - stays open when I put just hot water on.
Brief details of the system are as follows:
Boiler is: Ideal Classic FF370.
Closed system (no header tank - use mains to keep pressure "topped-up").
Controls are: Invensys Lifestyle
Actuator is: Drayton ZA5.
Any advice would be really welcome - even if it is as simple as "get the plumber in".
I have a zone value actuator that will not stay in the open position. With the heating "on" the actuator tries to open the valve, but when open it immediately snaps back to the closed position. I've taken the actuator off the valve and it continues to do this.
I looked at the bottom of the actuator with the heating on, and I can see the motor turning the "key", but I cannot see any reason why it should suddenly snap back shut.
My temporary solution has been to remove the actuator and manually turn the valve to the open position. I suspect this is not very efficient, but at least it heats the house.
What I am trying to get a feel for is whether the behaviour of the actuator is symptomatic of a problem elsewhere in the system, or whether it is symptomatic of a broken actuator. If the latter, it seems a relatively simple job to fix.
There is a second value in the system - I assume this is the HW feed, and this seems to work fine - stays open when I put just hot water on.
Brief details of the system are as follows:
Boiler is: Ideal Classic FF370.
Closed system (no header tank - use mains to keep pressure "topped-up").
Controls are: Invensys Lifestyle
Actuator is: Drayton ZA5.
Any advice would be really welcome - even if it is as simple as "get the plumber in".