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Hi Tony, the buzz is annoying in the early morning :? and I wonder whether there is a failure coming up sometime. But at the moment the system still seems to work ok - 25 years old. I'll check the screw etc in the morning. Ed

The actuator head sometimes buzzes quite loudly, when it’s just moved from ‘A+B’ to ‘A’ position (CH only). Very occasionally it starts when it’s been in ‘A’ position for a while. Powering off/on to reset to valve into the ‘A’ position usually stops it. Sometimes a light(!) tap with a hammer...