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Fan/Light help please

goldenboy1818
Hi I fitted a new envirovent extractor in a bathroom, they had a 12volt one before but the zone position was ok for mains. Obviously removed the transformer.


However after leaving at night the customer has rang to say the light that operates when switched on with the fan, has a constant dim light. Bulb is a small 3watt led. It must be getting some slight back feed, only when the fan iso is on. Has anyone experienced this before, greatful for any input. Thanks
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    Changing to ELV fan will not do much if there is only one transformer - the place that the steady live and the switched live meet and presumably cross-talk a few hundred microamps,  is at the over-run timer. The fact that the timer is driving a mains fan or an ELV one via a transformer is a secondary consideration.

    You may be lucky if the over-run timer is not the same design in the controller for the ELV one and for some reason has less cross-talk, but it is not the transformer or the fan voltage that is helping you.

    M.
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    Changing to ELV fan will not do much if there is only one transformer - the place that the steady live and the switched live meet and presumably cross-talk a few hundred microamps,  is at the over-run timer. The fact that the timer is driving a mains fan or an ELV one via a transformer is a secondary consideration.

    You may be lucky if the over-run timer is not the same design in the controller for the ELV one and for some reason has less cross-talk, but it is not the transformer or the fan voltage that is helping you.

    M.
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