Carrier 40MAQ Series - Fan Speed Out of Control Diagnosis and Solution (E3)

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Fan speed has been out of control diagnosis and solution (E3)
Error C ode E3
Malfunction decision conditions
When the indoor fan speed is too slow (300 RPM) for a certain time, the unit will stop and the LED
will display the failure.
Supposed Causes
S Wiring mistake
S Fan assembly faulty
S Fan motor faulty
S PCB faulty
Troubleshooting: