Step1: Disconnect gas and electrical power to the equipment and allow components to cool fully.
Step2: Remove the control panel to access the thermostat assembly and capillary system.
Step3: Carefully disconnect wiring and gas connections, marking positions for correct reconnection.
Step4: Remove the old thermostat bulb from the sensing bracket and withdraw the capillary tube.
Step5: Install the new thermostat, positioning the bulb securely in the sensing area.
Step6: Reconnect all fittings, secure the dial assembly, restore power, and test temperature control for safe operation.