my sunvic programmer has 6 terminals - live, neutral and terminals 1 to 4
my central heating cable has only 5 wires - live,neutral, red, yellow and black
my instructions say connect red to terminal 4, yellow to terminal 1 and black to terminal 3
the sunvic display works but the heating and water does not
do i need to make a bridging connection to terminal 2

stephen c, July 2010

how can i connect the 207 xls programmer with digital room thermostat tlx 7501?

Andreas Pitsillides, February 2011

is the wiring the same for sunvic 207xls as the 207xl

Clifford Ellis, October 2010

I can't answer for the wiring colours (they can wildy vary on installer), but the way it wires
N=N Obvious
L=L Obvious
HW off= terminal 1
HW on= terminal 3
CH on= terminal 4.


If you follow the wires to the wiring centre.
HW on connects to clyinder stat common
HW off connects (in some way) to the grey wire on the diverter valve)
Ch on connects (in some way) to the white wire of the diverter valve.
When I say some way, if you follow the cables, it should become apparent, if it dosen't consult someone who does know.

Terminal 2 is CH off which is NOT used on any CH system I know of.

Work safely

Carefree, July 2010