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Only 2 wires ? 3 and 4 what next ? Where 3 is going what about 4 ? What about 1/2 L and N

So neutrai from thermostat 1 is connected into neutral in terminal 2 and terminal 1 L from thermostat link with nr 4 and connected into terminal 2 with L and last one 3 (NO) is connected with terminal 2 middle with black

C pictures

Yes but i'm not in home now i'll do the pictures after 9 pm

So how this supposed to be connected?

It's a biasi riva advance he m110b 32sm/c Just i'm not sure if everything is ok after room thermostat connected when i was using a boiler without thermostat on was first and third light on but now when thermostat is connected when i turn on the heating i've got first green flashing and second...

hi Can u help me I've got biasi combi boiler and connected room thermostat yesterday everything working good but when I turn on the heating flashing first light green and second red but heating is working and hot water aswell when heating is on and i turn on the tap with hot water red is gone...