Step1: Switch off gas and electrical supply, then allow the unit to cool completely before servicing.
Step2: Open the access panel and detach the old thermocouple from the control valve and pilot bracket.
Step3: Route the new thermocouple along the original path, keeping it free from sharp bends or pressure points.
Step4: Secure the probe tip in direct pilot flame contact and tighten all connections firmly.
Step5: Restore gas supply, light pilot, and verify stable flame retention and proper shutdown response.