sorry to bring bad news but sounds like the board is defentally acting up again. How long has it been sence it was last changed?
Conveniently long enough for the last board that was installed/changed to be out of warranty, but no where near long enough to justify paying the same business another $400+ to change it for me, just to have the false sense of scurity a one years warranty offers. Hell, from the price I found on a new board from a good friend in Kentucky in the biz, I can change out 3 for the price the last one cost to have installed.
New board will ship by noon and should be installed by Sat, possibly Friday.
The temporary fix was to open the furnace front doors, unplug the purge fan and let the system cool
Funny and annoying thing about this. Monday morning, while the purge fan/blower was in a continuous looping cycle, we shut the whole system down with the main breakers on the house box.
Turning the juice back on a little after noonish, found the purge blower acting and playing nice, with not once trying to cycle on and off during the 3 hours the ac was cooling and before I un-plugged it's 110 vlt connectors. It must be possessed.