Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 332

-4- Outdoor Unit Fan
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.The revolution of the fan is approximately 600rpm at full speed.
When starting the fan, the fan runs at full speed for 5 seconds.
For the 2 fans for P168 - P234 models, the fan on the right (as you face the fan) runs at all times and the fan on the left
runs when required.(When heating except for defrost, both fans run.)
When setting the DIP SW1 as shown in the figure below, the inverter output [%] will appear. 100% indicates the full speed
and 0% indicates the stopping.
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.
When the fan does not work or an abnormal vibration occurs, the FAN board has a problem, or the fan motor runs under
open phase or opposite phase. (The microcomputer detects the open phase or the opposite phase of the main power
source; however, these malfunctions)
When the only one of the fans is running and the other fan is stopped, check the 52F output state on the self-diagnosis
LED first and check the fan connector and 52F connector misconnection, 52F failure, or the lead wire disconnection.
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[ IX Troubleshooting ]