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Hi folks, thanks for feedback. Reading 17.5v at fan (switched) L & N terminals. SL and PL clearly marked, so not reversed. Not 100% sure if fan wired in series or parallel (replacing old fan with new and existing wiring). Will a new light switch solve the problem? Thanks

Hi, I have installed a new extractor fan with a run on timer. Fan is wired in series with bathroom light switch circuit together with a permanent live to keep fan running after light switched off. Problem is fan run on timer does not stop fan, and measured 17.5V at the fan terminals when the...