No Heat Service Call Summary Equipment: Carrier High-Efficiency Furnace (1998) Fuel Type: Natural Gas Issue: • Furnace not producing heat Diagnosis & Work Performed: • Found hot surface ignitor failed (open / non-functional) • Universal ignitor on truck was not compatible with this model • OEM Carrier ignitor was available and installed • Restored heat and verified normal furnace operation • Tested ignition sequence, burner operation, and safety controls • Performed combustion analysis – results within normal operating range Results: • Furnace is running and heating properly at time of service • No immediate safety concerns noted following repair Important Notes: • This model of Carrier furnace has a known history of secondary heat exchanger clogging as it ages • Inducer motor on this furnace is very expensive and, if it were to fail, repair costs could be significant (potentially in the thousands of dollars) Recommendations: • Due to the age of the furnace an