Dont know if this will help you... but its worth a go

I've had trouble with timers blowing up.. 2 infact blew on me.

Finally I fiquired out the problem...

I would plug the timer into the wall in my bedroom, plugged in the extension lead into the timer, then ran the 20 metre extension cable from my bedroom up into the attic, then at the end of the extension cable I put a 4 socket "gang" lead.
That setup blew 2 of my timers.

So then what I did is take the timer from my bedroom & plugged it into the socket in the attic, so now the light was directly plugged into the timer, i've now had the timer for 4months & its still doing great.

Hopes this helps, peace.