On 22 Jan, 17:16, "TMC" wrote:
Replace dimmer with normal switch and see if they work OK

If so replace dimmer switch

Tony

Ok here's what I tried today. They've completely stopped working now.

I didn't explain this before but the dimmer switch is actually on a
dual plate dimmer switch with another dimmer for another set of
lights, which *do* work.

They are slightly different though. Both dimmers have three
connections marked L1, L2 and another symbol which looks like a
switch. On the working set all three are connected. On the faulty set,
only L1 and the switch are connected, there appears to be no wire for
L2.

Despite this, I decided to wire the faulty set into the dimmer switch
used by the working set and just use L1 and the switch on the known-to-
be-working dimmer.

This didn't work. The lights still don't come on. What would be a good
next step?

As an aside, there also appears to be two wires bonded within an
orange sleeve - I'm not sure if this is related to the 'missing' L2
wire on the faulty set.

frankly, its nor clear what you have.
separate dimmers and separate transformers, whether transformers are
electronic of toroidal or indeed anything.

Not sure if this was a reply to me or not... the faulty set has one
switch, four lights, behind each one is a dimmer transformer. I don't
know what toroidal means.

Thanks for your help!

Dan