DIY Doctor UK DIY Forums

Hi All,

I am trying to fit a honeywell DT90E Room Thermostat.
I have removed my old thermostat which is a Sunvic TLX 2356

The wires I have are:
Brown - Live I guess
Blue - Neutral I guess
Earth

Now the DT90E has three ports, A, B, and C

Which wires do I put into A, B and C?

I have a gravity system bolier - Glow Worm Ultimate its quite old

Thanks in advance for any help.

Regards
Squiral

Live in A
Switch live in B



You will find that your old stat will be:

Brown = Live
Blue = Switch Live


All the best.