Thanks for the reply, LJ. Circuit breakers check out ok. I've been searching for a schematic for days and haven't been able to come up with one for my Luxaire Model EFD015GAGA. Do you happen to know where one can find these schematics?
I will add this as food for thought. It is my understanding that when the system is operating in cooling mode, the blower operates on its high-speed coil. This also applies when one sets the thermostat to HEAT and the fan to ON (instead of AUTO). On the other hand, when the unit is set to operate in HEAT mode with the fan set to AUTO, I understand that the blower operates on the low-speed coil. Could it be the low-speed coil, or a relay to the low-speed coil, that is faulty? Thanks!