Thanks. I've read clearance should be 1-2mm. Mine is much more which would add up. If my AGA installer would just pick up the phone I'll get them to come and sort. Lack of them helping was the reason for the post.
Any help appreciated.
On the top of the oil control valve I have the electric component that plugs into transformer. As the temp rises, the lever above the pin (which is attached to the float in the reservoir I guess) rises. However. There is a gap between the pin and the lever. I think this...