SYMPTOM: control box has power, height has power, compressor runs, air coming out of unloader.
Check for a yellow connector pulled off any of the coil terminals or a white wire out of any one of the yellow connectors. If all of the connections are good then the coil itself could be burned out. Replace the coil. If air is still coming out of the unloader then it could be the valve is stuck open, then the valve would have to be changed.
Note: If it's a Snaptite valve bank, then those valve are no longer available. The whole valve bank would have to be updated.
