If not, your thermostat is likely malfunctioning. Have a buddy stand near the furnace and listen while you adjust the thermostat from “LOW” to “HIGH.” If he or she hears a sound, the problem is probably with your furnace. Check Thermostat Communication With The Furnace Someone may have adjusted it to a lower setting than you’d like. Check The SettingĮnsure your thermostat is turned on and switched to “HEAT.” Also, double-check the temperature. Your Thermostat Is The CulpritĪnother reason your furnace keeps shutting off could be the thermostat. Once again, this is important to allow proper airflow to the furnace. That’s okay, but make sure some vents are left open. You may have closed a few vents in the past when your room got too hot. Going forward, check the filter monthly, and clean or change your furnace filter at least every 90 days. Vacuum off any dirt and/or gently rinse and dry the filter, according to the manufacturer’s instructions. These are higher quality, but require an occasional cleaning. Replacements are inexpensive and readily available, so stock on a few spares.Ĭlean a reusable filter. If you see your filter is blocked, all you have to do is change or clean it.Ĭhange a disposable filter. Your furnace’s air filter gets clogged with dirt and dust over time, restricting airflow to the furnace. That will protect your furnace but leave you in the cold. If the airflow is obstructed, the heat exchanger will overheat, triggering the safety shutdown. Your furnace’s heat exchanger needs a good flow of air to cool it down. Troubleshoot this common furnace problem and learn how to fix it. Not only that, it may be signalling a bigger problem that you need to take care of. But a furnace that keeps shutting off every minute or two won’t heat your house properly. Normally, your gas furnace should cycle on and off 3-8 times hourly, maintaining a comfortable temperature in your home. Lennox Ductless Air Conditioners and Heat Pumps.
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