5.Troubleshooting
Diagnosis
Countermeasure
Connect CN15V-2 on
power PCB.
Replace the power PCB.
Replace the fan motor.
Replace the fan motor.
Replace the power PCB.
Repair wiring.
• When fan speed command
is 400min-1 or lower and
overcurrent status is detected
10 times continuously
• When actual fan speed is
100min-1 or lower for 30
seconds (Fan motor is locked.)
• When fan speed command is
400min-1 or lower and over
current status is detected 10
times continuously
• When actual fan speed is 100
min-1 or lower for 30 seconds
All models
• Disconnection of wiring or
loose connection of connector
• Fan motor anomaly
• Control PCB anomaly
• Power PCB anomaly
Notes: *1 Measurement item Connector of power source wiring for fan motors (RED - BLACK)
*2 Refer to resistance on another table (Page 58)
If the same error does not reappear, continue to get data with Mente PC.
Error code
Remote control:
7-segment display:
LED
Green
Red
Condensing
unit
Keep
flashing
*1
Content
–
E48-1,2 *1
DC fan motor anomaly (1/2)
Turn off the unit, disconnect CNFAN1 & CNFAN2 from control
PCB and turn the unit back on again
No
No
Y es
No
Replace the fuse
Y es
Is there a short circuit on
the fan motor power
source resistance?
Y es
*2
Y es
No
Y es
No
Is CN15V- 2
connected on power
PCB ?
No
No
Y es
A
Y es
Refer to next page
Is there DC325V
output on the fan
motors?
Is the power source
fuse on power PCB
burned out?
Save the Mente PC data of 30 minutes before stopping
Is there any
scratch on the
coating of the wiring and/or
is it disconnected?
Does the fan motor
of condensing unit rotateIs
smoothly when turning
it by hand?
Is there DC1 5V on
control PCB?
CN1 5V on
*1
*1 E48-1:FMO1 / 1-time flash, E48-2:FMO2 / 2-time flash
1. Applicable model
2. Error detection method
4. Presumable cause
3. Condition of error displayed
User Guide | Optyma™ iCO2
58 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030
