On Tue, 11 Dec 2007 09:23:51 GMT someone who may be "Keith Dunbar"
wrote this:-

I have a very antique Randall 103 central heating timer, which decided not
to switch on this morning - so perhaps the time has come to improve on it.
Trouble is, I can find to way to remove it from the wall. I've managed to
unscrew the cover at the bottom where all the wires come in. Of course I
could just smash it - but as I may not be able to get a replacement yet I'd
rather not do that. Has anyone any knowledge of how these come apart?

In a couple of minutes I had navigated to
http://danfoss-randall.co.uk/Content...U17416279.html
which appears to cover the whole range and I suspect includes
mechanical and electrical instructions.

As others have said most controllers have had a standard backplate
for many years. A replacement controller should fit on this
backplate, without disturbing the wiring. This controller could come
from almost any supplier.

Note that when you take the controller off the backplate some
terminals will be live, unless isolated elsewhere.



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54