"having checked it thoroughly, it is in perfect working order"
1st Something is obviously wrong.
How did you check it?
Looking does not do it.
2nd What's connected to the window?
A concealed magnetic contact?
A surface magnetic contact?
Micro switch?
An Inertia detector?
An electronic Viper type detector?
Lead Foil?
A Tube & Wire Frame?
See what we mean, information, information
3rd Had any work done?
4th Get the idea?
It also helps to continue in the original thread, saves those willing to give their help trying to understand the second post and having to go off searching for the first.
acorn
October 2010