**No Heat Call – Furnace Diagnostic** **Work Performed:** - Responded to no heat call for furnace previously maintained in September. - Noted recurring seasonal issues related to pressure switches; these were replaced a couple of years ago. - Upon arrival, cycled power to the furnace — system started and ran normally through multiple test cycles. - Verified all pressure switch ports and tubing clear and properly connected. - Inspected venting and overall operation — all appeared normal at this time. **Results:** - Furnace operating normally during visit; no active faults detected. - Intermittent issue suspected with pressure switches based on past history. **Recommendations:** - If the issue reoccurs, replacement of pressure switches is recommended as the most likely corrective action. - System will need to be in a failed state for accurate troubleshooting if the problem returns. - Furnace is showing signs of age; continue regular maintenance and monitor for further is