We have two thermostats, main floor and upstairs, for two separate zones of a hot water baseboard heating system. It's starting to get cold and I noticed that the upstairs thermostat (an old White-Rodgers 1F56-301) isn't turning on the furnace. (It does work fine with the a/c for the upstairs.) Should the second floor thermostat work independently of the first floor thermostat (which does turn on the furnace)? I don't even see where the 2nd floor thermo is wired, whereas I can trace the 1st floor one directly to the furnace.
Even though my wife would like it fine if the upstairs stayed freezing, it's getting a mite too cold for my tastes.
What can I check?
Thanks!