Anyone know much about troubleshooting gas forced air furnaces with electronic ignition? I've got a Coleman furnace in a rental which quit working. I understand furnaces with a standing pilot but this has electronic ignition. It has a red light on the printed circuit control panel that is supposed to flash, giving codes, as to what the problem is. The red light is simply glowing but the furnace won't operate. I've jumped the thermostat wires and it makes no difference. Any suggestions as to where to go from here?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13