I have just moved house and the central heating system is a bit ancient and looking to change it. The boiler is a Glow Worm Fuel Saver MKII with a Randal 103 and wired thermostat on the landing.
Can the Randall 103 that currently runs the system be replaced with a Honeywell CM927? In my old house I had a Combi Boiler and fitted a Honeywell CM927 myself which was very straight forward. I have been told that the Honeywell CM927 can be used as a replacement as the Randal 103 as they are both single channel units that control heating and hot water together.
The wires going into Randal 103 looks very different to my old Combi setup and I can’t figure them out despite reading loads about it. I think I may need a junction box to do the job and disconnect the old wired thermostat but any help with wiring would be much appreciated.
Many thanks in advance. View media item 54123 View media item 54124 View media item 54125
Can the Randall 103 that currently runs the system be replaced with a Honeywell CM927? In my old house I had a Combi Boiler and fitted a Honeywell CM927 myself which was very straight forward. I have been told that the Honeywell CM927 can be used as a replacement as the Randal 103 as they are both single channel units that control heating and hot water together.
The wires going into Randal 103 looks very different to my old Combi setup and I can’t figure them out despite reading loads about it. I think I may need a junction box to do the job and disconnect the old wired thermostat but any help with wiring would be much appreciated.
Many thanks in advance. View media item 54123 View media item 54124 View media item 54125