I have a Horstmann Channelplus XL heating timer. The timer is maybe
about 4 years old. It has inexplicably gone wrong and the display has
gone blank. Would like to have a look to see if it's just a simple
wiring problem but I can't seem to open it up. I've unscrewed the two
screws at the top and then thought it would be a simple case of
removing the timer from the backplate but no. Have really given it
quite a lot of force but it just doesn't come free.
One thing to mention at this point is I'm being a bit naughty and not
disconnecting the elecrical supply first. So many electrical things in
my house and I just don't want to have to reset the times & programs on
them all if I can avoid it, also not sure which fuse it would be on.
Guess you'll all come down on me like a ton of bricks for that but it
really shouldn't be a problem as I'm not touching any wires by opening
it up to have a look. (Course I'd switch the electricity off if I
actually need to do any work on it.) So that's part of my question
really, could it be that having electricity connected means you can't
take the timer off or is it something else I'm doing wrong? Cheers for
any advice.... Steve
know what is inside, is that you could move something into contact with
something else, or very close to it - as you pull it apart.
Also, sometimes leads pull off/out when you open boxes. The connections
may be in the top plate, but whoever installed it pulled back all the
slack after connecting the wires and mounting it. Silly, but it happens.
Mine is on its own circuit - and thus I wouldn't have to go anywhere
near the easily-identifiable main ring main fuses, to find which fuse it
is on. At worst I would put some lights out, not reset anything electronic.
No ton of bricks. If you short out something in a box in your hands a
few inches from your face, the odds are that all that will happen is the
fuse blows. A risk any gambler would be happy to take.
OK, so you get it open. What then? Unless you are an electronics
engineer/technician, you probably won't be able to mend it. Wiring
problems seldom happen to fixed wiring, IME. Only to flexes and other
things which have mechanical forces acting on them.
So, I would suggest going back to your consumer unit, identifying all
the circuits it couldn't be by the fuse ratings (eg ring mains, cooker,
electric water heater, off peak storage heating, whatever) and try the
ones that are left. Take a torch.
Then, when you are sure the power is off it - pull away.
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