Step1: Disconnect electrical power supply and allow fryer to cool completely before servicing; ensure gas supply is off if applicable.
Step2: Remove access panel and locate the existing hi-limit thermostat assembly inside the control housing area.
Step3: Carefully disconnect wiring terminals noting positions to avoid errors, then remove faulty thermostat from mounting bracket.
Step4: Install new thermostat securely into bracket, reconnect wires exactly as labeled or previously noted.
Step5: Reassemble panel, restore power, and test reset operation and high-temperature cutoff to ensure proper operation.