Toshiba HFC R407C Service Manual page 41

Check code
[11]
Indoor fan motor short circuit alarm
Does indoor fan operate for a
short period after resetting and
resuming?
Yes
Is there a connection error of
CN07 connector?
No
Is approx. DC12V to 13V output
to CN07 connector 1-3 pins?
Yes
Is revolution pulse input from
hole IC to CN18 connector 2-3
pins during fan operation?
(Measurement by tester:
Approx. DC2 to 2.5V)
Yes
Check code
[12]
Indoor PC board short circuit alarm
Is there an irregularity of
power source?
No
Indoor PC board check
Defective Replacement
Troubleshooting
Diagnostic procedure for check code
No
Yes
Is there a connection error
No
mechanical lock on the fan
No
Yes
Operation cause
1. Fan motor circuit connection error.
2. Capacitor error.
3. Fan motor error.
4. Defective indoor PC board.
of CN07 connector?
No
Is capacitor normal?
Yes
Confirm there is no
motor?
No
Operation cause
1. Irregularity of power source.
2. Noise of peripheral equipment.
3. Defective indoor PC board.
Modify connection and wiring.
Yes
No
Replace capacitor.
Yes
Replace fan motor.
Replace MCC-1292
PC board
Check power source voltage, modify
lines, remove noise, etc.
41