The relays switching the fan on are in the plastic control box mounted behind the fan guard/frame on the nearside.
Is your fan a 3-speed or a resistor moderated 2-speed? The latter has a silver or gold coloured resistor mounted on the frame behind the fan blades. Look through the blades in the 2 o'clock position.
You'll find everything you need to know somewhere on the forum, once it's clear where the problem is.
TC
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