Fan Monitor Fault (P0A81)

This fault is triggered when the BMS requests the external fan and the voltage measured at the fan monitor pin on the BMS is below (or above if inverted) the error threshold programmed into the profile. This is used strictly for monitoring performance of an external fan and alerting a user to a fan fault. This fault code can be disabled by setting the Max Fan Monitor Voltage value to 0.0v.

Resolving the issue:

Step 1) Determine if the system should be monitoring the fan voltage. If fan monitoring is not desired, this error monitoring should be disabled in the profile.

Step 2) Download the freeze frame data using the Orion BMS utility for this error code. Review the freeze frame data for the actual measured voltage and compare to the expected voltage.