Dan was very helpful and made me feel at ease with my questions.
Overall Experience
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Furnace clean and tune. Cycled system. Checked heat exchanger, ok. Checked, removed, and cleaned burners and flame sensor. Both ok. Igniter showing signs of getting worn, but tested ok at this time. Checked and adjusted gas pressures to maximize efficiency. No CO found in airstream. Filter should be changed. System is operating normal at this time. Job complete.