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