Dirty flame sensors interrupting gas furnace heating cycles
Why it happens here
A sensor can collect residue over time and fail to confirm a stable flame. During cold South Ward weather, longer furnace run times make repeated shutdowns more apparent. The furnace may ignite briefly and then stop, even though the thermostat continues to call for heat.
Our approach
We inspect the ignition sequence and sensor condition, clean or replace the sensor as testing supports, and confirm the burners remain lit through a full cycle. We also check airflow and the filter so the repair addresses related operating stress rather than only the first visible symptom.