How to Test a Hot Surface Ignitor | Lennox Furnace Troubleshooting for Error Code E207

Learn how to test a hot surface ignitor on a Lennox furnace and troubleshoot Error Code 207 (E207: Hot Surface Ignitor Sensed Open). This step-by-step guide covers how to check resistance (ohms), inspect wiring harness connections, and verify voltage to ensure proper ignitor operation.

What You’ll Learn:
What Error Code 207 means and how to diagnose it
How to safely isolate and test ignitor resistance
Acceptable ohm range for Lennox ignitors (39–70 ohms)
How to verify voltage output during a heat demand
How to confirm both ignitor and control board functionality

Always follow manufacturer specifications and safety protocols when performing live voltage tests.

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The descriptions, troubleshooting tips, actions, and instructions suggested in this video are recommendations only. Lennox makes no warranty or representation regarding these recommendations. It is the sole responsibility of the professional contractor to use his/her professional judgment in the installation and maintenance of HVAC equipment and to assume any liability associated with the results.