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The furnace lights and then shuts off within 2–5 seconds. The flame sensor fails to verify flame presence and signals the control board to cut gas, causing an immediate shutdown.
The furnace cycles through ignition attempts but never delivers heat. A faulty or dirty sensor cannot transmit a valid flame signal, so the control board cuts power to the gas valve.
The unit tries to ignite 3 times, fails each time due to no flame signal, then goes into hard lockout mode and displays an error code — a classic symptom of a failed flame sensor.
The furnace keeps turning on and off repeatedly without completing a full heat cycle. An oxidized or degraded flame sensor rod causes intermittent signal loss, triggering repeated safety shutoffs.
💡 Pro Tip: Diagnose Your Flame Sensor Before Replacing
Your part is likely the culprit if you notice any of the following:
⚠️ Furnace ignites briefly then shuts off within 2–5 seconds of startup
⚠️ Furnace attempts ignition 3 times then locks out with an error code
⚠️ No heat delivered despite the burner appearing to light momentarily
⚠️ Furnace keeps cycling on and off repeatedly throughout the heating cycle
🔍 Technician Tip: Before replacing, try cleaning the sensor rod with a fine abrasive pad (like fine steel wool or emery cloth). A thin oxide coating on the rod is often the cause of false "no-flame" readings. If cleaning does not restore normal operation after one heating cycle, replace the sensor — it has likely degraded beyond recovery.
📦 What's in the Box
✅ 1× Furnace Flame Sensor Rod 62-23543-01 (90° offset, 1/4" male quick-connect, 2-1/2" length)
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Disclaimer: Compatibility information, part numbers, and model fitment data on this page are sourced from manufacturer databases and third-party references. While we strive for accuracy, please verify your appliance model number before ordering. Heima is not responsible for errors or omissions in compatibility listings.
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