Hitachi RAS-18FH6 - CHECKING THE INDOOR UNIT ELECTRICAL PARTS; 2. Indoor fan does not operate (others are normal); 3. Air deflector does not move (others are normal)

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2. Indoor fan does not operate (others are normal)
Can the fan be stopped by remote
control?
The microcomputer fan PWM
output (at pin ) is 1-5V.
Replace the microcomputer.
Replace the fan motor.
Replace the microcomputer.
Perform final operation check.
3. Air deflector does not move (others are normal)
Are pulse signals output at
microcomputer pins - when
auto swing is turned on in the fan
mode?
Replace the microcomputer.
Is a voltage over 15 or below 10V
being generated on the 12V line?
Replace IC111.
Ye s
Ye s
Ye s
Ye s
No
No
No
No
Check IC711. If it is normal,
replace the air deflector motor.
Perform final operation check.
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RAS_AW_063-082e 11/17/06, 11:54 AM73