Good evening and thank you for allowing me to join your forum. I'm pretty handy with most things but this is driving me mad !!! I have a Honeywell Smartfit programmer T8677B1006 7 Day Optimised Room Unit and the LCD display has stopped working. I have checked the voltage to it from the base unit and it is 12v. I therefore assumed that the unit was defunct. I sourced a new old stock direct replacement and expected it to work. Alas, it didn't work which I assume means that the fault is elsewhere. I have checked what I can on the base unit.
240v in and 12v out. The wire between the base unit and the room unit is good. What am I missing ??? TIA Ian Freezing cold in Cornwall !!!