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Following your instructions, new thermostat is in place and the heating is working correctly. Thanks a lot for your help Stem !

Hello, I am hoping someone could help, I have a combi-boiler and looking to replace my RS1 thermostat with a Honeywell T4. The current RS1 thermostat has 4 wires: Neutral - Blue Live - Yellow 3 / Call - Red Earth - Yellow/Green The new Honeywell thermostat is battery powered and only...