Wiring External Timer problem

[johnpt]

Hello All - I am changing a faulty timer for a Glowworm Boiler with an APT timer. There is no valves or stats so its seemed fairly basic. I have a fused spur which feeds an APT timer - brown blue & green from fused spur is Live In (Brown), Neutral (Neutral) & Earth (green) too APT Timer - then i have a 4 core cable from APT too Boiler -
1 Black = Live Out (APT) = Switch Live at boiler,
2 Brown = Live In (APT) = Permanent Live Boiler
Neutral = Too Neutral

The problem is although the timer works and turns On/Off boiler the light on Timer stays on when its in off position -the light dims but still stays on. What am I doing wrong

http://www.glow-worm.co.uk/stepone/data/downloads_sd/8f/00/00/micron-80ff.pdf

Please see page 24 of the above for wiring diagram

 

[Marvo]

I've moved this to the central heating forum for you Johnpt where you should get better replies.

 

[grimysparks80]

Sounds like youre getting a backfeed from somewhere. maybe a divertor valve in the boiler.

Check the voltages you have at the timer.