F0773 fault in WEG CFW500 Drive indicates the HVAC Plug-in Module is not Detected. This means the specialized HVAC expansion card is either missing, improperly seated, or incorrect for the application.
Cause:
- The installed plug-in module does not match the plug-in module for the specific HVAC function.
Remedy:
Ensure the physical plug-in board matches the required HVAC application specifications. Check module slot fitment.
