Flashing LEDs when fan and lights off

[clanky boy]

Good afternoon everyone.
I have fitted an extractor fan in my bathroom with an overrun timer, to start when the bathroom led lights are turned on. I have wired the feed to the fan via an adjustable overrun timer and DP isolator with the SL for the fan timer coming from the light switch.

The issue is with lights and fan off the LEDs are flickering dimly - this stops when the DP switch is opened. I assume there is a small leakage to N from somewhere in the timer causing the sensitive LEDs to flicker, which when the DP switch is opened cannot occur hence the flicker stops.

I have bought and fitted a 47nF 100r capacitor and connected it to all possible combos in the timer - no change. The only thing that stops it is if I disconnect the SL from light switch yo timer - but obviously the fan wont run now.
I have spoken to a qualified sparky who's only suggestion was the capacity action as a snubbed - he doesn't know what to do now!

I am stumped and would appreciate any advice please.

 

[Avo Mk8]

Have an extra pint for me. Glad you got it sorted. Just shows there are some clever people on here. And me of course

And it only took us 90 posts to fix it

 

[Mike Johnson]

Took most of us 85 posts and just a couple from Marconi.

 

[marconi]

Clanky boy: Please would you explain your choice of 'nom de plume'. Just curious 'cos for a sparks it suggests mechanical rather than electrical.

 

[wzwzrd]

Hi All
First of all many thanks for this post and getting to a solution. - this forum is awesome!

I'm having exactly the same problem.
I've gone through the posts and just wanted to be absolutely certain on the fix before I go out to start buying and fitting the same components.
I understand that the 200V Zener Diode fixed the issue.
Could you provide the link to the 200V Zener Diode that fixed the issue.
Would it be possible for you to provide a guide on where to fit the 200V Zener Diode and any tips you feel are relevant.

This problem has been baffling me for ages so I just want to get everything right and installed in the same way as clanky boy to make this go away - hope you understand - Thanks