Technicaion insisted that fan condition was due to a faulty circuit board. Later during the night,, I solved the problem by lowing the humidity setting on the thermostat. .
Response from Belair Engineering and Service Company:
I would like to send out our Service Manager out (no-charge) to take a thorough 2nd look at your system to make sure it's running as it should. Warm regards, Don Risher VP Belair Engineering