Error code
Remote control:
7-segment display:
LED
Green
Red
Keep
flashing
Content
–
E89
Communication error between CPU of control PCBs
5. Troubleshooting
Diagnosis
Countermeasure
Are the
wiring harnesses and
cables passing above
the CPU?
Is the
J-pin inserted to JPX2?
And is JP11
opened?
Does E89 recur?
After inserting
the J-pin to JPX2 and
opening the JP11,
does E89 recur?
NO
YES
YES
YES
NO
NO
NO
YES
After disconnect the J-pin from JPX2 and
short the JP11, rewrite the software
program of IC1 and IC2 to the latest
version.
Or replace the ROM to the latest version
one
If it occurs 4 times within
15 minutes
Control PCB anomaly
→
Replace control PCB.
Software program version
before rewritten was
unmatched.
IC2 is in software rewriting
mode.
CPU may be malfunctioned
by the influence of wiring.
Rearrange to keep
wiring away from the
circumference of CPU.
・
Noise
・
Mixing of software versions
・
Control PCB anomaly
Note:
1.Applicable model
All models
2.Error detection method
When the communication
between CPUs is interrupted for
a certain period of time
Condition of error displayed
4.Presumable cause
1-time
flash
Condensing
unit
User Guide | Optyma™ iCO2
70 | BC408445719305en-000101
© Danfoss | Climate Solutions | 2023.01 | LCA012A030