I have an Aprilaire 600 Humidifier that had a manual humidistat. I swapped out the humidistat with the newer Aprilaire #58 auto humidistat and now the humidifier won't turn on. I have power on the new humidistat, the outdoor sensor is working, but when i turn the dial to test/reset, the humidifier doesn't turn on like it's supposed to. Does anyone have an ideas? Could it be a faulty humidistat?

Humidifiers - Aprilaire - 600 Humidifier