I am replacing my sunvic 2259 thermostat with a sunvic 4101, but can't make sence of the wiring.
The 2259 has 3 connections and the earth connected to a metal back plate, while the 4101 has connections COM, DEM, SAT, and N. I can't figure out which wire to stick where.
I have read an earlier post on there where the poster had 3 wires - red, black and unsheathed. But i have 4 wires, blue, red, yellow and unsheathed.
All help gratefully recieved...running out of 3 amp fuses now lol.
Thanks in advance.
Matt.