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Thanks for your response and suggestions! Yes, there is an old type SUNVIC programmer with a timer function, and it is set to CONSTANT (always ON), so the terminal 3 is in this case a permanent live.

Hi! I would like to replace my old thermostat Sunvic TLX 2259 with the following wiring With a Control RF Programmable Room Thermostat & Relay Box What is the correct way to wire the thermostat? It will work as a simple thermostat, no combi boiler, no zones. According to the diagrams...