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What is the possible causes of INFb fault, with no brake resistor ?

What is the possible causes of  INFb fault. with no brake resistor ?

Product Line:

ATV61HD30N4, ATV61HD37N4 

INFb fault

InFb  [Internal- th. sensor]
• The drive temperature sensor  is not operating correctly
• The braking unit's temperature sensor is not operating correctly
• Inspect/repair the drive
• Replace the braking unit's temperature sensor
• Inspect/repair the braking unit
• The monitoring of this fault must be disabled by the [Brake res. fault Mgt] (bUb) parameter,  if there is no braking unit connected to the drive
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