HVAC Procedure and Performance Guide

Replace solid-state control board

Training for this procedure can be found in these courses:

                         131 – Oil Heat l  and  161 – Boilers l


Solid-state control board must be replaced according to manufacturer’s specifications. Plug-in type board connections must be protected and not handled.  System in which board is installed must function according to manufacturer’s specifications.  Applicable safety procedures must be followed.


  1. Review job order and manufacturer’s specifications.
  2. Determine mounting requirements, type of connections, board functions, electrical requirements and dip-switch settings.
  3. Collect tools, equipment and materials.
  4. Put on safety and protective equipment and apparel.
  5. Locate board to be replaced.
  6. Disconnect electrical power to equipment.
  7. Remove access cover(s).
  8. Disconnect wiring harnesses, remove board retainers and remove old board.
  9. Verify that new board is suitable replacement.
  10. Plug in new board, secure according to manufacturer’s instructions and connect wiring harnesses.
  11. Set dip-switches according to specifications.
  12. Place system in operation and check performance.
  13. If equipment does not operate to specifications, troubleshoot and make required adjustments and repairs.
  14. Replace access cover(s).  (Note: Disconnect power if needed for safety reasons).
  15. Leave equipment in required operating status.
  16. Remove safety and protective equipment and apparel.
  17. Gather tools, equipment and leftover materials and leave work site clean.