What short cycling is
A furnace that runs 2–5 minutes, shuts off, then restarts repeatedly. It wastes gas, wears parts and never heats the house evenly.
Dirty filter and overheating
Restricted airflow makes the heat exchanger overheat, and the high-limit switch shuts the burners off. Replace the filter first.
Dirty flame sensor
A sooty flame sensor cannot prove the flame is lit, so the control shuts gas off within seconds. Cleaning or replacing it is a quick furnace repair.
Oversized furnace
A furnace too big for the home heats the air near the thermostat fast and shuts off. Only a properly sized replacement fixes this.
Thermostat location
A thermostat near a register or in direct sun fools the system. We can relocate it — see thermostat installation.
Need furnace repair? See our Furnace Repair page, or find your city on the locations page and call (855) 459-5498.
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