Where is the switch for the fan, in the fan/light itself?
I'd start there.
Brian

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The Sofa of Brian Gaff...

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"bert" wrote in message
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In one bedroom we have a ceiling fan supplied from the lighting circuit.
It's been there for over 10 years no problems.
In the past few nights a couple of times when switching it off the RCD
protecting the ring mains has tripped. But the lighting circuits don't go
through it and the lights are still on including the one which is part of
the fan and the fan itself can be switched back on.
Puzzled as to how this can happen - and where to start looking.
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bert