Indoor Fan Motor Rotation Speed Anomaly - Mitsubishi Electric FDF71VNXVD Technical Manual

Error code Error code
E20
Remote controller: Remote controller:
-
7-segment display:
1. Applicable model
All models
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
─50rpm] 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
• Indoor fan motor anomaly
• Foreign matter at rotational
area of fan propeller
• Fan motor anomaly
• Dust on control PCB
• Blown fuse
• External noise, surge
Note:
LED LED Green Green Red Red
Keeps flashing 1 time flash
Indoor Indoor
Keeps flashing Stays Off
Outdoor Outdoor
5. Troubleshooting
Diagnosis
Does any
foreign matter intervene
in rotational area of fan
propeller?
NO
Does the fan
rotate smoothly when turned
by hand?
YES
Is DC280V
detected between �-� of
fan motor connector
CNM?
YES
Is the fuse F202 blown?
Reset the power supply and restart.
Does it become normal?
172
-
Content Content
Indoor fan motor
rotation speed anomaly
YES
NO
Note (1) � for GND
(1)
NO
NO
YES
NO
YES
-
'11 • PAC-T-160
Countermeasure
Remove foreign material.
Replace the fan motor.
Check power supply
voltage.
Replace fan motor and
power PCB.
Replace fan motor. (If the
anomaly persists after
replacing the fan motor,
replace the indoor control
PCB.)
Malfunction by temporary
noise