Furnace Troubleshooting: Common Problems & Fixes
Furnace filters should be changed every 30-90 days to allow for proper air flow. 4. Check Circuit Breakers. Could you have blown a fuse? Locate your fuse box, and look for the switch marked "furnace.". If no such marker exists, then look for the switch flipped opposite of all the others, and then flip it back. 5.