Service manual

66
14
Troubleshooting
Diagnostic Procedure for Check Code
Check code Operation cause
1. Irregularity of power source
[12]
2. Noise of peripheral equipment
Other indoor alarm
3. Defective indoor P.C. board
Check code Operation cause
1. Fan motor circuit connection error
[11] 2. Capacitor error
Indoor fan motor alarm 3. Fan motor error
4. Defective indoor P.C. board
Does indoor fan operate
for a short period after
resetting and resuming?
Is there a connection
error of CN18 connector?
Is there an irregularity
of power source?
Is there a connection
error of CN07 connector?
Is capacitor normal?
Confirm there is no mechanical
lock on the fan motor?
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)
Modify connection and wiring.
Replace capacitor.
Replace fan motor.
Replace MCC-1355-01
P.C. board
Check power source voltage,
modify lines, remove noise, etc.
Indoor P.C. board check
Defective  Replacement
No
Yes
No
No
No
Yes
Yes
Yes
Yes
No
No
Yes
No
Yes
Yes
No