I have a twenty year old Thermo Pride Furnace powered by oil.Recently when I have the thermostat,a Honeywell T87 turned up to sixty eight degrees the furnace and blower will shut off at sixty eight degrees not seventy like it use to.When the house temp drops two degrees below my setting the furnace comes back on like it should.What is causing the furnace to shut off sooner than it should.I change the fliter every month.
- posted
11 years ago