I've got a Trane varispeed airhandler with electric heat. Normal operation EXCEPT.... Heat will not come on unless fan is in on position.
Unit was smoked up in a fire but no water or heat damage.
Disassembled and r&r'd all insulation. Unit sat outside but undercover for 4 months. Possible moisture/ high humidity to board.
1 green LED appears to flashing a code
2 red LED intermintant on different cycles.
Any Trane techs out there care to venture a guess before I change the module? Thanks.