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Thanks for the reply.

I had 5 wires in the old thermostat.

I knocked on my neighbours' door and checked her thermostat - got my colour/label mappings that way. Everything is working fine now....

I am installing a programmable thermostat (upgrading from a previous programmable that wasn't to our liking.

When taking the old thermostat off, I noticed 4 of the 5 wires were labelled. That's a...