Step1: Turn off boiler power and water supply at main valve using lockout tagout.
Step2: Depressurize system completely before servicing to ensure safety.
Step3: Remove old probe and clean fitting threads thoroughly.
Step4: Apply thread sealant to MPT threads evenly per manufacturer specs.
Step5: Insert new probe into nut fitting and align properly.
Step6: Tighten securely without over-torquing to avoid damage and prevent cracking.
Step7: Restore water, power, and test operation for leaks and system function.