Mitsubishi Electric MSZ-A09RV-E1 Service Manual page 44

2. Checking mis-wiring and serial signal error.
MSZ-A09RV -
E1
MSZ-A12RV -
E1
Outdoor unit does not operate. When the operation indicator lamp (on the left-hand side) flashes on and off continuously
or only once.
Is the self-check function of indoor unit indicated when relay 52C turns ON
3min. later?
wShort circuit of JPS (one-hour short circuit jumber cable) and JPG (GND
resistance) enables self-check function to be indicated within 3 min.
Correct wiring
Green Sign
21 22 23 24 25 26 27 28 29 30
flash
Replace in-out connecting
wire.
· Main circuit
· Reactor
· Noise filter P.C.
board
defective
· Connection of
connector
1. Turn OFF power supply.
2. Turn ON power supply.
3. Press the EMERGENCY OPERATION switch.
Yes
Is there indoor-outdoor mis-wiring,
poor contact, or disconnection?
Turn off power supply and confirm that indoor-outdoor
wiring is correct.
Short-circuit indoor terminal block N and 3.
B
While pressing OPERATE-STOP button on remote
controller, press RESET button.
(The above procedure allows Power monitor lamp to
indicate the failure-mode) w2
Does Power monitor lamp (on the right-hand
side) flash on and off when OPERATE/STOP
button on remote controller is pressed?
Open-circuit indoor terminal block N and 3,
Check if there is amplitude of 5 to 10VDC between outdoor
terminal block N and 3
(for confirmation of serial signal) and if there is 220-240V
AC between 2 and N
1. Unplug the power cord.
2. Disconnect the connector between compressor and
transistor module.
3.Plug the power cord.
4. Press EMERGENCY OPERATION switch.
No
Is there approx. 220-240V AC between outdoor
terminal block 2 and 1 ?
Is there 370V DC between both ends of
No
smoothing capacitor(C62) on the electronic
control P.C. board?
Replace outdoor electronic control P.C. board.
Mis-wiring indication
No
A
Yes
Yes
Yes
Yes
44
ON 2.5 seconds OFF
Serial signal error indication
w1 If there is any error in
serial signal system, the
mis-wiring indication will
appear by turning the
power off and then
turning it back
w2 Mis-wiring may damage the electronic
control P.C. board during the operation in
the left. Be sure to confirm the wiring is
correct before the operation starts.
w The serial signal indication on the Power
monitor lamp (right side) facilitates
checking abnormality, based on the
failure-mode
w3 Replace indoor
No
electronic control
P.C. board.
(light up or OFF)
w3 Be sure to release the
failure-mode recall function
after checking.
A
· Turn off inverter-
controlled
lighting
equipment.
· Plug the power
cord.
· Press
EMERGENCY
OPERATION
switch.
Is mis-wiring or
serial signal error
No
indicated when
relay 52C turns
ON 3 min. later?
Yes
B
ON
· Keep the unit
away from
fluorescent
light.
· Attach a filter
to light-
intercepting
part.