Furnace not turning on

If you have your thermostat set to a warm temperature but you have noticed that it’s not turning on, you’re likely experiencing a minor issue that you may luckily be able to fix yourself.

If your furnace isn’t turning on, you should start by checking your thermostat, air filter, circuit breaker, blower cover, condensate pump and line, and furnace switches.

If your furnace isn’t turning on, the first thing you should do is check your thermostat and make sure the batteries are not dead, and the setting is on heat and fan setting is on auto. If your thermostat is not on heat and auto and/or doesn’t have fresh batteries, it may not turn on. If everything is well, then you should next check your air filter. If your filter is clogged, it will reduce the airflow to your furnace, which can cause your furnace to overheat and shut off. Filters should be replaced every 1-3 months. The circuit breaker tripping can also be a cause of the furnace not running properly. If the circuit labeled furnace has moved to the middle or neutral position, the breaker has tripped. Turn it off and back on. If your furnace was recently maintained or you took the cover off of your furnace to check something, the blower cover may not be on as tightly as it needs to be. Many furnaces have a safety feature called a blower door safety switch that prevents the furnace from turning on if the blower cover isn’t secured tightly. If there is a block in the condensate pump or drain line, water may back up in the system, triggering the system to shut down to prevent water damage. If there is a blockage, a technician will have to clear it. There are a variety of safety switches in your furnace that each monitor a certain part of your furnace and will trigger the system to shut down if that part isn’t working properly. Be sure to check the pressure switch, flame sensor, limit switch, and flame rollout switch. You might need to read your furnace manual to get a better idea of which switch is indicating a problem. You can also make the decision to call a HVAC professional to diagnose the problem.

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