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2. Only indoor fan does not operate (others are normal)
Is 25-35V DC being generated
between blue and red of CN10,
CN15 in the "Hi" fan mode?
No
Is the microcomputer fan PWM
output (pin
) ÒHiÓ in the fan
mode or are pulses being output
from it?
No
3. Indoor fan speed does not change (others are normal)
Can the fan be stopped by remote
control?
No
Yes
Is 5V DC being generated
between blue and yellow of CN10,
CN15?
No
Yes
Perform final operation check.
Yes
The microcomputer fan PWM
output (pin
) is ÒHiÓ.
No
Perform final operation check.
Yes
Replace the indoor fan motor.
Check according to the proper
method for checking the power
circuit.
Replace Q901 or Q903.
Replace the microcomputer.
Yes
Replace the microcomputer.
Replace Q901 or Q903.
Replace the microcomputer.
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