Carrier 38MHRC - The indoor fan speed is operating outside of the normal range (E3;F5)

38MHRC: Service Manual
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DIAGNOSIS AND SOLUTION (CONT)
The indoor fan speed is operating outside of the normal range (E3/F5)
Description: When the indoor fan speed remains too slow (below 300 RPM) for an extended period of time, the LED displays a failure code and the
unit turns off.
Possible causes:
• Wiring mistake
• Faulty fan assembly
• Faulty PCB
Troubleshooting
A210598