Cause : Internal fan fault comes when the fan warning function is an extra protective function that checks if the fan is running/mounted. The fan warning can be disabled in 14-53 Fan Monitor ([0] Disabled). For the D, E, and F-frame filters, the regulated voltage to the fans is monitored.

Troubleshooting :

• Check for proper fan operation.
• Cycle power to the adjustable frequency drive and check that the fan operates briefly at start- up.
• Check the sensors on the heatsink and control card.