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Hi Dan, I did mention that the advice was vague so if you could expand on what 'balancing the rooms' entailed that would be much appreciated.im not a heating engineer nor am I accustomed to doing these things so any elaboration would be helpful TCC, I don't know what it means to 'zone'...

I have a Honeywell cm901 thermostat. It's a wired one that sits on the first floor. When iset the programmed timer it only seems to work on the first floor. The radiators on the lower floor just remain cold even when they are turned to the max. The only thing that seems to work is setting the...