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@stem , thank you - that all worked! Can't really tell about LOW/HIGH as I never fully understood how it works, but the basic thermostat does what it supposed to do.

@stem "If I'm correct, this function drops the set temperature by a few degrees when selected, so tends to be used at night time to maintain a lower temperature than during the day." That's correct, there is a switch downstairs that we were told it kind of does this - switched between LOW/HIGH I...

@stem , thank you, you totally right, here is the picture with diagram (the one made in West Germany is the old one ;), the other one the new one). Also a photo of existing wiring.

Hi all, house came with this old fancy type of heating and one thermostat stopped working. I had a spare one of these: https://www.amazon.co.uk/dp/B00QGKSTD8/ref=pe_27063361_487055811_TE_dp_1 that simply takes three wires - red, black and yellow/green. But the existing one has 6 wires: a) one...

I got that one, in a house built 1987ish near Dartford :) The way I understand it after 2 years of using: 1) scale 1-5 increases the temperature from 15*.. so 1 would aim for 16, 2 - 17, .. 5 - 20 2) but if you switch to High on the main switch, it adjusts the base temperature to 20*, and then...