7
Cause of Error
Cause: The PG motor is equipped with a speed feedback signal
line. When the feedback signal is not received by the control
panel, it has no way to recognize the fan moving. This will be
indicated as “Internal fan error”.
Tools Required Multimeter, A PG motor
Possible Broken Part Mechanical error, PG motor, controlpanel
Troubleshooting
Procedures
1. Check if the fan can work for 1 minute by itself before the
error occurs. If yes, there is no mechanical error.
2. Disconnect the power supply and move the fan blade by
hand to see if there’s any resistance.
3. Reconnect the drive wire and speed feedback wire to
exclude any fan error due to connector loosening.
4. Check if the plug-in terminal of speed feedback on the
control panel is loose and pull the terminal slightly for
inspection if necessary.
5. Replace the motor in the faulted air conditioner with
other PG motor (do not fix it with the fan for the time
being), if the main control panel still indicates “internal
fan error”, then replace the main internal control panel; if
the error disappears, replace the internal fan.
E4 – INTERNAL FAN ERROR (INDOOR PG MOTOR)
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