81
Troubleshooting
Diagnostic procedure for check code
Check code Operation cause
[11] 1. Fan motor circuit connection error
Indoor fan motor short circuit alarm 2. Capacitor error
3. Fan motor error
4. Defective indoor PC board
Does indoor fan operate for a
short period after resetting and
resuming?
Is there a connection error of
CN18 connector?
Is approx. DC12V to 13V output
to CN18 connector 1-3 pins?
Is revolution pulse input from
hole IC to CN18 connector 2-3
pins during fan operation?
(Measurement by tester:
Approx. DC2 to 2.5V)
Is there a connection error
of CN07 connector?
Is capacitor normal?
Confirm there is no
mechanical lock on the fan
motor?
Modify connection and wiring.
Replace capacitor.
Replace fan motor.
Replace MCC-1355- 01
PC board
Yes
Yes
Yes
Yes
Yes
Yes
No
Yes
No
No
No
No
No
No
Check code Operation cause
[12] 1. Irregularity of power source
Indoor PC board short circuit alarm 2. Noise of peripheral equipment
3. Defective indoor PC board
Is there an irregularity of
power source?
Check power source voltage, modify
lines, remove noise, etc.
Indoor PC board check
Defective Replacement
No
Yes
14
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