Indoor Fan Does Not Operate (Others Are Normal); Air Deflector Does Not Move (Others Are Normal) - Hitachi RAS-18FH6 Service Manual

2. Indoor fan does not operate (others are normal)

Can the fan be stopped by remote
control?
No

3. Air deflector does not move (others are normal)

Are pulse signals output at
microcomputer pins - when
15 18
auto swing is turned on in the fan
mode?
Yes
Is a voltage over 15 or below 10V
being generated on the 12V line?
No
Yes
The microcomputer fan PWM
output (at pin ) is 1-5V.
24
Perform final operation check.
No
Yes
Replace IC111.
Perform final operation check.
– 73 –
Yes
No
Replace the microcomputer.
Replace the fan motor.
Replace the microcomputer.
Replace the microcomputer.
Check IC711. If it is normal,
replace the air deflector motor.