How do you know when it’s time to call in technicians for a furnace repair? When the system won’t turn on, of course. If it has nothing to do with the circuit breaker (or blown fuse), the thermostat batteries, or the settings on the thermostat, it’s something you’ll need an expert to fix for you.
However, many furnaces show signs of breaking down long before they ever turn off completely. It’s important that you know the subtler signs of a furnace breaking down, so that you can schedule repairs before you’re stuck without heat on a cold night. Besides, it typically costs less to fix a furnace that is still working than one that has completely broken down! Pay attention to these signs of trouble.