if you don't mind i will try to assist you. if you are mechanically inclined just a little i could help you save a few bucks, if not i'll tell you if this happened right after the battery replacement then the temperature blend doors may need to be re calibrated ($100)
if the a/c light thats one the button flashes then you more than likely is low on freon, to have the system checked ($100 and recharged excluding freon). good luck. i hope i helped and please accept my answer. thanks T-MAN
HelloCustomer my name is Mike.
There is a possibility that a recalibrate with specialized equipment is needed but there is a simple proceedure you can try before going the pay route.
When battery power is removed from the controller, the actuator positions need a basic relearn. Use the following steps to perform the calibration update:
Good luck, if this does not work then the previous advice you were given would be the proper route.