AC blower fan ramps up at night

[auxarcman]

I have a new Heil heat pump with variable speed motor, and a new thermostat. During the day, with temps in the upper 90s, it seems to run great and cycle appropriately. At night, though, the blower motor ramps up really high (loud) and runs continuously. Tech came yesterday and said the coolant was low, which was probably the problem, so he charged it up. However, it's the middle of the night now and the blower is running full-out, even though the set-temp has been reached. Anyone have any ideas as to why, when the temp is lower outside, the blower runs so *

[Freon]

How old is the * Has this problem recently * Have you had any work done on the system... new thermostat or annual maintenance * Any recent electrical storms before this behavior *

It could be a control board issue or a thermostat issue. I would remove power to the entire system for 20 minutes and then restart. Maybe a reset of the control circuit is all you need. Let us know what happens.