I have a radiator which has a new Siemens TRV on it. Only id on it as the
numbers 29 and 215. Does not seem to work as it should, rather it seems to
be either off if I set it to 1, or on if I set it to 2, 3, 4, 5.
I have noticed though that there are 2 small slidable tabs on the side of
the valuve...one red and one blue. I guess these allow me to set cut-off
temperature or something. Currently they are both slid down to the bottom.
Does anyone know what these are for and what I should do to get this TRV to
work like any normal TRV should.
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