HomeAnswersSigns your furnace needs professional attention
Signs your furnace needs professional attention
Urgent: stop and call
A smell of gas, a burner that will not stay lit, soot around the unit, or a carbon monoxide alarm going off. Turn the furnace off at the switch, leave the gas alone, and call your gas utility first. Those are safety calls, not scheduling calls.
Soon: book a visit this week
Cold air from the vents while the furnace is running, a blower that runs continuously, repeated lockouts that reset themselves, a yellow or lifting flame instead of a steady blue one, or a unit that runs far longer than it used to for the same thermostat setting.
Normal, but worth watching
A quiet tick when the burners light, a slight delay before warm air arrives, or a little more noise on the coldest nights. These are usually not failures on their own. They matter when they appear together with a higher gas bill.
Why the gas bill is the honest early warning
A furnace loses efficiency gradually. The first sign is often a winter bill that climbs while the weather did not, which is a quieter signal than a breakdown and cheaper to act on.
What to have ready when you request a visit
The brand and approximate age, whether the flame is blue, what the thermostat is set to, and whether any of it started after a filter change. That saves a return trip.