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It was in the actuator itself, which was a little worrying. It does seem to be working fine now, so possibly got in there by accident, or maybe something to do with the manual lever which therefore wouldn't affect normal usage. I'm sure if it is required for operation it'll make itself known...

Thanks Mick! I went to Screwfix yesterday and picked up a replacement actuator, and after debating whether to fit it yet (I have guests tonight and didn't want to risk screwing up and having no heating) I decided to give it a go. Removed the old one, which practically fell apart in my...

Hi Guys, Got a problem with my heating at the moment in that the boiler is not switching off when the thermostat clicks off. I think I've pinned it down to the motorised valve, which is a Drayton two-port with a ZA5 actuator. If I move the manual lever then release it the burner clicks...