2-14. E: 51. Indoor unit fan motor rotation speed error (Indoor
unit)
Indicator
→ired remote
controller
Error code E: 51
Detective actuator Indoor unit
Main PCB →hen the fan motor feed back rotation value which is
detecting on the main PCB becomes 0 and lasts for
more than 1 minute at motor operation condition.
Or, when the feed back rotation value contimues at 1/ 3
of target value for more than 1 minute.
Fan motor
Forecast of cause
Fan rotation failure
Fan motor winding open
Motor protection by ambient temperature increase
Capacitor failure
Main PCB failure
Check point 1. Check rotation of fan
Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor)
If fan or bearing is abnormal, replace it.
Check point 2. Check motor winding
Check Indoor unit fan motor. (Refer to indoor unit fan motor in "Service parts information" on page
03-50.)
If fan motor is abnormal, replace it.
Check point 3. Check ambient temperature around motor
Check excessively high temperature around the motor. (If there is any surrounding equipment that
causes heat)
Upon the temperature coming down, restart operation.
Check point 4. Check motor capacitor
Check continuity of motor capacitor.
If it is shorted, replace the capacitor.
Check point 5. Replace main PCB
If Check Point 1 to 4 do not improve the symptom, replace main PCB.
End
2-14. E: 51. Indoor unit fan motor rotation speed error (Indoor unit) - (03-20) - 2. Troubleshooting with error code
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