We are now running the fresh air fan just 7 hours a day between 8AM & 8PM.
The timer runs one-hour-on and one-hour-off with the last two hours on.
Using the 7 hour mode, and after detector reset #3, the readings are at
1.6 pCi/L 
The radon sump hole has been dry for a few days now, and it seems
that I was wrong about the sump pump's dry running lowering the radon.
The readings are very low now and the pump has not been running at all.
My next test will be to turn off the fresh air blower and watch the radon level.
I'm planing to wait until a few days of rainy weather roll in..
Don't like to suck in fresh air with 100% humidity.
