I've checked the wiring in the light switch, isolation switch and extractor fan. It all looks fine, so is the most likely problem the fan is just broken?
I should be clear that when I say the wiring looks fine, what I mean is all the correct wires are going into the correct terminals. I'll replace the fan and see how that goes.
Or so I thought. I only did a short check before returning to finish the job today. The fan has an overrun timer controlled by a jumper and 4 pins. It's supposed to be adjustable for 5, 15 and 30 minutes, but no matter which two pins I connect it runs for 30 minutes. It's a Domus STF100-T, which I bought as a like-for-like replacement for the broken Silavent GTF100-T. Pins circled in photo.
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