31
When OPERATION INDICATOR lamp flashes ON and OFF in every 0.5-second.
Outdoor unit doesn’t operate.
No
Replace the
indoor/ outdoor
connecting wire.
Is there voltage approximate 280V DC between
LD61A (+) and LD66A (–) on the inverter P.C.
board arter 3 minutes?
Turn OFF the power supply and then turn ON
again.
Press EMERGENCY OPERATION switch.
After 3 minutes, is there approximate 230V AC
between outdoor terminal block
2
and
N
?
w
4 Replace the inverter P.C.
board.
Does the right side of OPERATION INDICATOR
lamp blink quickly?
w
2 Mis-wiring may damage indoor electronic
control P.C. board during the operation.
Be sure to confirm the wiring is correct
before the operation starts.
Replace the indoor
electronic control
P.C. board.
No
Replace the indoor/ outdoor connecting wire.
Release the failure mode.
w
3
Yes
Yes
A
B
Turn OFF the power supply.
Disconnect the indoor/ outdoor connecting wire.
Short-circuit indoor terminal block
N
and
3
.
Turn ON the power supply.
During pressing both the OPERATION SELECT button
and TOO COOL button on the remote controller at the
same time, press the RESET button.
At first, release the RESET button.
And release the other two buttons since all LCD in
operation display section of the remote controller is
displayed after 3 seconds.
Transmit the signal of remote controller, pressing
OPERATE/STOP (ON/OFF) button on the remote
controller.
(The above procedure allows OPERATION INDICATOR
lamp to indicate the failure-mode.)
Remove the short-circuit between indoor terminal block
N
and
3
.
Reconnect the indoor/ outdoor connecting wire.
Turn ON the power supply.
Press the EMERGENCY OPERATION switch.
Is there amplitude of 5 to 10V DC between outdoor
terminal block
N
and
3
after 3 minutes (for confirmation of
serial signal)?
1. Turn OFF the power supply.
2. Disconnect the connector (CN61) between the
compressor and the power transistor module.
3. Turn ON the power supply.
4. Press the EMERGENCY OPERATION switch.
No
Yes
No
Yes
(light up or OFF)
Is mis-wiring
indicated when
the contactor
(52C) on the
indoor electronic
control P.C.
board turns ON
3 minutes later?
Yes
No
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again.
· Press the EMERGENCY
OPERATION switch.
B
· Reinstall
either the
unit or the
light each
other away.
· Attach a filter
on receiving
section of
the indoor
unit.
w
3 Be sure to release the failure-mode
recall function after checking.
w
4 Be careful to the residual voltage of smoothing capacitor.
Procedure of release of failure-mode.
1
Press the EMERGENCY
OPERATION switch.
2
Turn OFF the power supply.
3
Press the RESET button on the
remote controller.
Start
No
• Turn ON the power supply.
• Press once EMERGENCY OPERATION switch.
Is there any mis-wiring, poor contact,
or wire disconnection?
w
2
Make them sure.
Yes
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on indoor unit.
w
w
Short circuit of JPG and JPS on the indoor
electronic control P.C. board enables
self-check to be displayed in 3 seconds.
Yes
Is there 230V AC between outdoor terminal
block
2
and
N
?
No
Replace the
indoor/ outdoor
connecting wire.
A
•The following indication
applies regardless of shape
of the indicator.
Blinking
Operation Indicator
As for indoor unit MSZ type, refer to service manual OB327.
As for indoor unit MCFZ type, refer to service manual OB344.
AMPM
CLOCK
:
AMPM
How to check mis-wiring and serial signal error (when outdoor unit does not work)
N
OB328A --2qxp 04.4.26 4:50 PM Page 31
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