Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 233

Error code
Indoor control PCB
Remote control:
E48
Outdoor control PCB
Outdoor inverter
1. Applicable model
Models FDC71-140VNX, 100-
140VSX, 200, 250VSA
2. Error detection method
Detected by rotation speed of
outdoor fan motor
3. Condition of error displayed
When actual rotation speed
of outdoor fan motor (FMo1)
drops to 100min or lower
-1
for 30 minutes continuously,
the compressor and the
outdoor fan motor stop. After
3-minute delay, it starts again
automatically, but if this
anomaly occurs 5 times within
60 minutes after the initial
detection.
4. Presumable cause
• Defective outdoor unit control
PCB
• Foreign material at rotational
area of fan propeller
• Defective fan motor
• Dust on outdoor unit control
PCB
• Blow fuse
• External noise, surge
Note: When E48 error occurs, in almost cases F2 fuse (4A) [Model FDC71:F3 fuse (2A)]on the outdoor unit control PCB is blown. There are a
lot of cases that fuse is blown and E48 occurs due to defective fan motor. And even though only the outdoor unit control PCB ( or fuse) is
replaced,, another trouble (*1) could occur. Therefore when fuse is blown, check whether the fan motor is OK or not.
After confirming the fan motor normal, check by power ON. (Don't power ON without confirming the fan motor normal.)
*1 The error which does not seem to relate E48 may occur like as "
communication error (E45) and etc.
LED Green
Keeps flashing
Keeps flashing
Yellow LED
PCB
Keeps flashing
5. Troubleshooting
Does any foreign
material intervene in rotational area
of fan propeller?
NO
Does the
fan rotate smoothly when turned
by hand?
YES
Is DC280V
detected between (CNFAN Œ
(red)- (blue)) of fan motor
connector?
YES
Power source reset
Is normal state restored?
Red
Content
Stays OFF
Outdoor fan motor anomaly
1-time flash
(Models FDC71-140VNX, 100-140VSX, 200, 250VSA only)
Diagnosis
YES
NO
Is F2 fuse blown?
Note (2) Fuse of model FDC71 is F3.
", Stay OFF of LED on outdoor unit control PCB, inverter
WAIT
232
- -
'19 • PAC-T-327
Countermeasure
Remove foreign material.
Replace fan motor.
NO
If resistance between
➀ (Vm):red - ➃ (GND):blue
is detected 1k W or lower, it
is faulty.
(2)
Check power source
NO
voltage.
Replace faulty fan motor
YES
and outdoor unit control
PCB.
Replace fan motor. (If
NO
anomaly persists after
replacing fan motor, replace
outdoor unit control PCB.)
Malfunction by temporary
YES
noise.