Step1: Disconnect appliance from power/gas and allow to cool completely for safety, ensure unit is isolated.
Step2: Remove access panel and locate the existing thermostat assembly for servicing.
Step3: Disconnect wiring terminals carefully, noting positions before removal.
Step4: Unscrew and remove old thermostat from mounting bracket and housing.
Step5: Install new thermostat, secure mounting, and reconnect wires to matching terminals securely.
Step6: Reassemble panel, restore power, and test temperature calibration, verify operation.