Troubleshooting Outdoor Unit Fan Problems - Mitsubishi Electric R410A Service Handbook

[8-7 Troubleshooting Outdoor Unit Fan Problems ]

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 P120, P144, and P168 models.)
For how to read the SW settings, refer to the following page(s). [9-1-1 How to Read the LED](page 301)
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. For details, refer to the following
page(s).
(TLMU)
[8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 268)
[8-9-7 Checking the Fan Board Error Detection Circuit at No Load](page 268)
[8-9-8 Checking the Fan Inverter for Damage at No Load](page 269)
[8-9-9 Checking the Fan Inverter for Damage with Load](page 270)
(YLMU)
[8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 279)
[8-10-7 Checking the Fan Board Error Detection Circuit at No Load](page 279)
[8-10-8 Checking the Fan Inverter for Damage at No Load](page 280)
[8-10-9 Checking the Fan Inverter for Damage with Load](page 281)
HWE14080
Fan 1 Fan 2
SW4 SW4
- 257 - GB