[8-7 Troubleshooting Outdoor Unit Fan Problems ]
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HWE12050 GB
8 Troubleshooting Based on Observed Symptoms
8-7 Troubleshooting Outdoor Unit Fan Problems
(1) Fan motor (common items)
To check the revolution of the fan, check the inverter output state on the self-diagnosis LED, as the inverter on the outdoor
fan controls the revolutions of the fan.
When starting the fan, the fan runs at full speed for 5 seconds.
When setting the DIP SW4 (when SW6-10 is set to OFF) as shown in the figure below, the inverter output [%] will appear.
100% indicates the full speed and 0% indicates the stopping. (Fan #2 is only on the EP300 through EP450 models.)
As the revolution of the fan changes under control, at the interphase or when the indoor unit operation capacity is low, the
revolution of the fan may change.
If the fan does not move or it vibrates, Fan board problem or fan motor problem is suspected. When checking the fan motor
for problems by shutting down the power, be sure to disconnect the motor wire from the fan board. If a short-circuited fan board
malfunctions, it will keep the fan motor from rotating smoothly. For details, refer to the following page(s).
[8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 237)
[8-9-7 Checking the Fan Board Error Detection Circuit at No Load](page 237)
[8-9-8 Checking the Fan Inverter for Damage at No Load](page 238)
[8-9-9 Checking the Fan Inverter for Damage with Load](page 239)
For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 253)
98765432110 98765432110
ON
ON
SW4
Fan 1 Fan 2
SW4
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