Why Does My Furnace Keep Shutting Off?
Direct answer: A furnace that keeps shutting off is often protecting itself from an ignition, flame sensing, airflow, or safety switch fault. Repeated resets without diagnosis can hide the real cause, so note when it stops and what the thermostat shows.
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What to check before you call
Check the thermostat, filter, and power switch, and note whether the furnace tries to start, lights, then stops, or never lights at all.
Ignition and flame sensing faults
A weak ignitor or a dirty flame sensor can stop a furnace after a few seconds. A tech tests both in sequence, rather than replacing parts at random.
Airflow and safety switch faults
A blocked filter, closed vents, or a tripped safety switch can also stop a furnace. Those checks come before a part is replaced.
Related reading
Related services: AC Installation, AC Tune-Up, Heating Repair. Related area: Village at Donelson Farms in Arlington.
Brands We Service
All makes and models. If your brand is not listed, call (901) 667-9876 and we will take it from there.
CarrierTraneLennoxGoodmanRheemYorkAmanaBryantAmerican StandardDaikinMitsubishiFujitsuBoschHoneywellNestEcobee
Independent repair company. Not affiliated with or authorized by the brands listed.
From call to comfort in four steps
- Book your visit. Call or message us and we confirm a time window.
- Upfront diagnosis. Your tech checks the whole system, finds the actual fault, and explains it in plain words.
- Straight price. You get options with real numbers before any work starts. You decide, with no pressure.
- Fixed and tested. We repair, test everything, clean up, and walk through the result with you before we leave.
Questions we hear a lot
Why does my furnace start then stop?
It is often an ignition or flame sensing fault, or a safety switch that trips when airflow or venting is wrong. The sequence of start, light, and stop helps a tech trace it.
Should I keep resetting my furnace?
No. Repeated resets can hide a safety fault and wear parts. Note the pattern, check the filter, and call for diagnosis.
Is a furnace shutting off dangerous?
It can be, if the cause is a venting or heat exchanger issue. If you smell gas or burning, leave the area and call for help right away.
Can a dirty filter shut off a furnace?
Yes. Low airflow can trip safety switches and stop heating. A loaded filter is a common, simple cause worth checking first.