Mitsubishi Heavy Industries FDT28KXE6A Service Manual page 93

Error code
E48
Remote controller:
E48-1, 2 *1
7-segment display:
*1 E48-1: 1 time flash (FMO1), E48-2 : 2 time flash (FMO2)
1. Applicable model
Outdoor unit
2. Error detection method
• If 400 min or lower of the
-1
fan rotation command and the
state of overcurent are detected
for 10 times continueously.
• If 100 min of the actual fan
-1
rotation speed is detected
for 30 seconds (Fan motor is
locked)
3. Condition of error displayed
Same as above.
4. Presumable cause
• Breakage of harness
or loose conection of
connector
• Outdoor fan motor anomaly
• Inverter PCB anomaly
• Outdoor control PCB anomaly
Note:
If the error does not recur, connect the Mente PC and continue to collect data.
LED Green Red
Keeps flashing Stays Off
Indoor
Keeps flashing *1
Outdoor
(
Inspect also the fan motor 2 even if it is E48-1.
5. Troubleshooting
Inspect also the fan motor 1 even if it is E48-2.
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Does the
fan rotate smoothly when turned
by hand?
YES
Is 15V
of power for control PCB
detected? Is the outdoor fan motor
OK? (Refer the checking method of
15V in page
46)
YES
Reset power supply and restart
Is E48
restored at 10 seconds after
compressor starting?
YES
Turn the power supply OFF
Interchange the connectors of fan motor
harnesses at the connectors on outdoor
control PCB side
Start operation again
Is the
fan motor failed to start up
switched?
91
–
Content
Outdoor DC fan motor anomaly
–
)
Countermeasure
Check and save the data of
operating conditions
Replace fan motor
NO
Replace inverter PCB
NO
or fan motor
Check it as much as
possible under the
operating conditions for
30 minutes before error
occurred
Wait and see.
NO
Continue to obain data, if
possible
(Keep connecting the
Mente PC)
Replace fan motor
NO
Replace outdoor control
YES
PCB