nope nothing to do with the main thermostat, close every other radiator and see if the problem one gets hot, the main thermostat is simply an on?off switchTaken the thermostat off and the needle moves in and out fine, radiators has been bled so can’t work out why it’s not working well. It has hot water in the in pipe, the top of the radiator is luke only warm and the bottom cold. Maybe a problem within the main thermostat.
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