Problem
Unit goes into a supply fan proving fault but the VFD never tries to start. This fix applies to units without the Supply Fan VFD Bypass option or with Supply Fan Bypass option but the unit is NOT in the Supply Fan VFD Bypass mode.
Resolution
Make sure that in the VFD settings that parameter 8-01 Control Site, is set to Control word only [2].
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.