Does the device have power?

You can determine that device is powered if the LCD display is illuminated.  

If it is not illuminated, check the common wire connection. C must be connected to C on the furnace.  

Why is my furnace fan running constantly?

Check your thermostat. If the air handler fan is running when it shouldn't, first determine what state the AirCycler® is in. If the AirCycler® is telling you that it sees an input from the thermostat, make sure the FAN switch is set to AUTO and not ON and that it is not calling for heating or cooling.  

The furnace fan does not shut off when AirCycler® g1 is removed from base (when thermostat fan switch is on)

Check wiring - “G” wire from thermostat should be wired to “Gt” on AirCycler® g1. “Gf” on AirCycler® g1 should be connected to “G” on furnace.

My AirCycler® has a blank display

1. The furnace has power
2. The thermostat is operational
3. The furnace will call for heat from the thermostat
4. The fan operates with a fan only signal from the thermostat
5. Confirm the furnace is providing 24 VAC to the AirCycler®
6. Verify wiring conforms to wiring diagram
7. Make sure top is firmly seated in the base

My AirCycler® turns furnace fan on and off, but the motorized damper does not cycle

1. Verify that the AirCycler® is providing a 24 VAC signal to the motorized damper
2. Verify that 24 VAC motorized damper is operational by powering directly with a 24 VAC signal
3. Verify continuity in the wiring between the damper and the AirCycler®
4. Verify damper power switch is in up or automatic position (for damper model # FAD ONLY)

 
My AirCycler® turns on during fan cycling calls

1. Verify wiring conforms to wiring diagram
2. Verify the G wire is properly connected
3. The G wire needs to be interrupted by the AirCycler®.
4. Do not run the G wire parallel.