Step1: Turn off power supply and disconnect appliance from mains to ensure electrical safety.
Step2: Remove access panel and place old thermostat assembly inside unit housing.
Step3: Disconnect wiring, noting terminal positions for correct reinstallation later.
Step4: Unscrew old thermostat and replace it with new unit securely.
Step5: Reconnect wires to matching terminals ensuring tight and correct connections.
Step6: Mount thermostat, reattach panel, and ensure everything is properly secured.
Step7: Restore power and test temperature control for proper operation.