No I dont have underfloor heating. Its not a dedicated floor heating stat its an optional sensor and setting. The default setting is to measure air temp.
So the old stat is a 20 year + Drayton RTC. We had the main programmer changed fron an old Danfoss Randell 4033 programmer to a Honeywell...
Can anyone help with a connection issue i have changing my old Drayton Type RTC room stat to a Excelvan BYC17.GH3 Programmable Heating Thermostat.
On the Old Drayton I have 2 cables coming one with a red and an earth wire and the other with a red, earth, Blue and a yellow wire.
Earths go to...