I have a thermostat upstairs, and one downstairs. The one downstairs has stopped working. I replaced it with a new digital one, but still no heat. I have heat upstairs though, so now not sure what the problem could be. So my question is, could only some of my pipes be frozen, while others are still working? I have oil heat, water baseboards. I have a bathroom in my downstairs that is getting hot/cold water just fine. So do I wait it out for them to thaw, or spend the money to have someone come in??? Obviously no pipes have burst, or I would have called already. Please help!