I need some advice on replacing an old Central Heating thermostat with a new digital Honeywell THR840DUK. The Thermostat controls an Oil fired boiler which provides Hot Water & Central Heating.
The old thermostat I'm replacing is a Potterton PRT100 and is wired as follows.
The wires are Red, Yellow & Blue. (The white colouring is actually paint)
Wiring Diagram for Potterton PRT100
Please can some one advise what wires I need to connect to the new thermostat A B C
Many thanks.
The old thermostat I'm replacing is a Potterton PRT100 and is wired as follows.
The wires are Red, Yellow & Blue. (The white colouring is actually paint)
Wiring Diagram for Potterton PRT100
Please can some one advise what wires I need to connect to the new thermostat A B C
Many thanks.