Mitsubishi SRK100VNXWPZSX, Service Manual

Page: 109 / 202

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108
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'20 • PAC-SM-351
Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
E20
Indoor fan motor rotation
speed anomaly
Keeps flashing 1-time flash
Keeps flashing
Stays OFF
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
NO
YES
YES
Does any
foreign material
intervene in rotational area
of fan propeller?
Is DC280V
detected between
➀
-
➃
of
fan motor connector
CNM?
Is it normalized?
Is the fuse F2 or 3, 4 blown?
Does the fan
rotate smoothly when turned
by hand?
YES
NO
NO
NO
YES
（ 1 ）
Note (1)
➃
for GND
NO
YES
Power source reset
Remove foreign material.
Replace the fan motor.
Check power voltage.
Replace faulty fan motor
and indoor unit control PCB.
Replace fan motor. (If the
error persists after replacing
the fan motor, replace the
indoor unit control PCB.)
Malfunction by temporary
noise
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
-50 min
-1
(FDU ： -500 min
-1
)]
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 control
PCB
• Foreign material at rotational
area of fan propeller
• Defective fan motor
• Dust on indoor unit control
PCB
• Blown fuse
• External noise, surge
Note: