What to do When Your Furnace Won't Ignite Published on February 23, 2017 We are making our way through the last few weeks of winter but we still need our furnaces, especially during cool nights. Nothing is worse than laying down at night and realizing your furnace won’t start up. If you find yourself in this situation, here are some things you can check yourself before calling Hammond Plumbing & Heating. Check Air Filters You should replace standard air filters every 30 days. If you fail to do so, they can get clogged, obstructing air flow and resulting in a furnace malfunction. Check Your Thermostat Start by turning the thermostat up a few degrees to get the furnace to turn on. If the current room temperature is higher than the thermostat, the furnace won’t run. Also, confirm the system switch is on “heat” or “auto.” Check the Power It may seem ridiculous, but make sure the power switch next to the furnace is “On.” Even gas heating equipment uses electricity so confirm the breaker has not tripped and that the power switch was not accidently flipped to the “Off” position. If you inspect all these things and your heating equipment will still not start up, give Hammond Plumbing & Heating a call at 226-240-1120 and we’ll come out and take care of you as soon as possible.