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(2) Power is not turned on though Indoor P.C. board is replaced
<Confirmation procedure>
YES
YES
NO
NO
To item of
“Power is not turned on”.
Turn on power supply.
Does operation lamp flash?
Is wired correctly to white and black
lead wires of terminal block?
Correct wiring.
(3) Only the indoor fan does not operate
<Preliminary check>
1. Is the socket voltage 220–240V?
2. Does not the indoor fan rotate in cooling operation?
(In heating operation, the indoor fan does not rotate to prevent cool air blowing when the unit has been activated.)
Does the fan rotate?
Control P.C. board failure.
Normal
Turn ON the power.
(“REMOTE CONTROLLER” position)
Motor circuit (D05, D06, IC01, Q07) or
12V power circuit (Q01, D02) failure.
Replace the P.C. board.
Motor control circuit (IC01, IC05,
D06, Q07) or 12V power circuit,
(Q01, D02) failure.
Are lead wires of P02 and
P03 connected to MF capacitor?
Does the stop at the
operation stop condition?
Does the rotating
speed of the fan lower?
Does AC120V or
higher voltage apply to between
red and black lead of the motor?
When rotating the Multi-blade
fan by hand at the operation stop
condition, is the rotation signal
(DC+12V 0V) detected between
2
(Purple lead) and
3
(Blue lead)
of the motor connector (CN14)?
(3 pulse / 1 revolution).
Stop the
operation.
Start operation
at HIGH cooling.
Change the setting
to LOW cooling.
NO
YES
NO
NO
YES
YES
NO
NO
NO
NO
YES
YES
YES
YES
Turn OFF the power.
Turn ON the power.
Replace the P.C. board.
Connect the lead wires properly.
Is it possible to rotate the
Multi-blade fan by hand?
Replace the Multi-blade fan.
Replace the fan motor.
Replace the P.C. board.