Goodman 100-4 gas furnace, no blower fan

Old 10-27-10, 01:43 PM
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Goodman 100-4 gas furnace, no blower fan

Stat calls for heat, draft motor runs, ignitor glows, burner lights... no blower fan & burner goes out after 30 sec. Recycles, but burner does not light. Cleaned flame sensor, no difference. Blower runs with fan sw. "on". Furnace works if I turn fan sw to "on" then switch mode to "heat", but runs continuously. Burner will not stay lit with fan in "auto" position. Red LED lite is on steady during all functions.
Old 10-27-10, 06:56 PM
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Check to see if the pressure switch is no staying closed reliably. If it open it interrupts the burner ignition cycle.

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