Friedrich MM18YJ, Service Manual

Page: 44 / 83

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C5 is displayed
on the unit.
Is there jumper cap on the
controller?
Install a matching
jumper cap.
No
Is the jumper cap inserted
incorrectly or improperly?
Re-insert the jumper
cap
The mainboard is
defined abnormal
replace it
Yes
No
Yes
End
Is the
malfunction
eliminated?
No
No Yes
Replace the jumper
cap
No
Yes
Is the
malfunction
eliminated?
Is the
malfunction
eliminated?
Possible causes:
1. There is no jumper cap on the controller;
2. Jumper cap is not inserted properly and tightly;
3. Jumper cap is damaged;
4. Controller is damaged.
See the
chart below: