Mitsubishi Electric MCFZ-A12WV Service Manual page 16

MCFZ-A18WV
MCFZ-A24WV
:
CLOCK
AMPM
12345
AMPM
•The following indication
applies regardless of shape
of the indicator.
Blinking
Operation Indicator
Reconnect the
power supply
cable.
Check of power
supply.
As for outdoor units MUZ-A18YV and MUZ-A24YV,
refer to service manual OB346 REVISED EDITION-A.
• Turn ON the power supply (Indoor/ outdoor unit).
• Press once EMERGENCY OPERATION switch.
After 3 minutes, mis-wiring is indicated
(0.5-second ON, 0.5-second OFF)
on OPERATION INDICATOR
lamp on the indoor unit.w
Yes
Is there any mis-wiring, poor contact,
Make them sure.
or wire disconnection? w2
Turn OFF the power supply (Indoor/ outdoor unit).
Disconnect the indoor/ outdoor connecting wire.
Short-circuit indoor terminal block N and 3.
Turn ON the power supply (Indoor/ outdoor unit).
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.
B
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.)
Does the right side of OPERATION INDICATOR
lamp blink quickly?
Release the failure mode. w3
Remove the short-circuit between indoor terminal block N
and 3.
Reconnect the indoor/ outdoor connecting wire.
Turn ON the power supply (Indoor/ outdoor unit).
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)?
No Is there 230V AC between outdoor terminal
block L and N?
Is there 325V DC between CN801 1 and 3 on the
No
outdoor electronic control P.C. board?
Replace the outdoor
electronic control P.C.
board.
Start
No
A
Yes
Yes
Yes
Yes
16
w Short circuit of JPG and JPS on the indoor
electronic control P.C. board enables
self-check to be displayed in 3 seconds.
w2 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
No
electronic control
(light up or OFF) P.C. board.
Replace the
No
indoor/ outdoor
connecting wire.
w3 Be sure to release the failure-mode
recall function after checking.
Procedure of release of failure-mode.
1 Press the EMERGENCY
OPERATION switch.
2 Turn OFF the power supply
(Indoor/ outdoor unit).
3 Press the RESET button on the
remote controller.
A
· Turn OFF inverter-controlled lighting
equipment.
· Turn OFF the power supply and then
turn ON again (Indoor/ outdoor unit).
· Press the EMERGENCY
OPERATION switch.
· Reinstall
After 3 minutes,
is mis-wiring
indicated on
No
OPERATION
· Attach a filter
INDICATOR
lamp on the
indoor unit?
Yes
B
either the
unit or the
light each
other away.
on receiving
section of
the indoor
unit.