Step1: Disconnect power and allow the unit to fully cool before servicing.
Step2: Remove the access panel to reach the heater chamber or water reservoir assembly.
Step3: Label and disconnect the terminal leads from the old cartridge heater.
Step4: Unscrew and remove the heater from the mounting port.
Step5: Install the new heater into the fitting and tighten securely.
Step6: Reconnect wiring terminals, ensuring tight and correct connections.
Step7: Restore power and check for proper heating and leak-free operation.