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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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    Low energy lamps flickering or dimly lighting when meant to be "off" is a common problem - usually due to capacitive coupling between the L and SL wires - especially where they run next to each other without a c.p.c. in between (so triple & earth cable on a 2-way switching arrangement can be worse when the switches are in a certain position).


    The fan complicates things a bit - the extra load on the SL line should if anything help reduce the problem. So perhaps there's some coupling between the perm L and SL lines due to the wiring layout changes, Or as you say perhaps a little current flowing back from the fan's electronics from L to SL.


      - Andy.
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    Low energy lamps flickering or dimly lighting when meant to be "off" is a common problem - usually due to capacitive coupling between the L and SL wires - especially where they run next to each other without a c.p.c. in between (so triple & earth cable on a 2-way switching arrangement can be worse when the switches are in a certain position).


    The fan complicates things a bit - the extra load on the SL line should if anything help reduce the problem. So perhaps there's some coupling between the perm L and SL lines due to the wiring layout changes, Or as you say perhaps a little current flowing back from the fan's electronics from L to SL.


      - Andy.
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