Mitsubishi Heavy Industries FDUA160AVSAVH Service Manual page 88

Error code
E20
Remote control:
Note (1) Value in ( ) is for FMi2.
1. Applicable model
DC fan motor only
2. Error detection method
Detected by rotation speed of
indoor fan motor
3. Condition of Error displayed
When the actual fan rotation
speed does not reach to the
speed of [required speed
-1
-500 min ] after 2 minutes
have been elapsed since the fan
motor rotation speed command
was output, the unit stops by
detecting indoor fan motor
anomaly.
4. Presumable cause
• Defective indoor unit power
PCB
• Foreign material at rotational
area of fan propeller
• Defective fan motor
• Dust on indoor unit control
PCB
• Blown fuse
• External noise, surge
• Indoor unit control PCB
anomaly
• Motor control PCB
Note:
LED Green Red
Keeps flashing 1 ( 2 ) -time flash
Indoor
Keeps flashing Stays OFF
Outdoor
5. Troubleshooting
Diagnosis
Po From previous page
•In case of FMi2
(1)
Is DC280V
detected between
of fan power PCB connector
CNM2?
YES
Power source reset
Is it normalized?
87
-
Content Indoor DC fan motor
rotation speed anomaly (2/2)
Note(1) for GND
NO
NO
Is the fuse F2 blown?
YES
NO
YES
-
'21 • PAC-SM-398
Countermeasure
Check power source
voltage.
Replace faulty fan motor
and indoor unit power
PCB.
Replace fan motor.
〔 If the error persists after
replacing the fan motor,
replace the indoor unit
control PCB 〕
Malfunction by temporary
noise.