*Navien and Williamson Boiler Warranty Process: Contractor contacts Navien or Williamson tech support BEFORE returning parts or units to local branch. Navien or Williamson tech support will decide next steps and provide case # if part or unit return is required.
**Equipment Unit Exchanges: All equipment unit exchanges must have Johnstone Supply SEWI tech support approval BEFORE removing equipment. Units returned without proper approval will be scrapped at customers expense.