Garola is right...
You fail to mention just what the switch is intended to control - a shower - a light - a light and extractor fan - something else - you also do not mention the wires being presented to it. People trying to hep you can only guess which may be dangerous for you.
If it's for a shower and you wire it back to front then the Neon Light will remain permanently on but the shower will still work - when it's wired correctly the neon will go on and off as you operate the switch.
If you wire it in a bizarre fashion the results will be unpredictable but loud bangs and breakers tripping could be the result.
Take care...
Peccavi
January 2010