Step1: Disconnect power and depressurize boiler/tank for safety; apply lockout/tagout if available.
Step2: Remove old probe and clean mounting port threads thoroughly to ensure proper seal.
Step3: Install new probe using correct gasket/sealant as specified by manufacturer guidelines.
Step4: Tighten securely without over-torquing to avoid damage to probe or fitting.
Step5: Reconnect wiring per diagram ensuring correct terminal alignment and insulation safety.
Step6: Restore power and test water level operation to confirm accurate sensing and operation.