Experiencing intermittent loss of pilot flame for Heil Natural Gas Furnace Model VG-105AE-18. Furnace about 25 years old, have owned it the last 6. The pilot can be relit rather easily, but after a period of 5 to 30 days (varies each time), it goes out again. The pilot burner had some debris in it and was promptly cleaned. The area around the burners has remained fairly clean.
Also, noticed slight "banging" sound from ducts just prior to furnace heat-cycle shutoff. This noise is not very loud, however it is noticeable.
The loss of pilot is more a nuisance than anything, but any advice regarding corrective action would be appreciated.
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