Mitsubishi Electric MXZ-2D33VA, Service Manual

Page: 128 / 538

128
11-time flash
15-time flash
‡ Check the connecting
wire between the outdoor
control P.C. board and
the power P.C. board.
‡
Replace the power P.C.
board.
‡ Check the connecting
wire between the control
P.C. board, the noise
filter P.C. board and
the power P.C. board.
‡
Check the voltage of the
power supply.
‡5HSODFHWKH power P.C.
board.
‡ Check the voltage of the
power supply.
‡5HSODFHWKHRXWGRRU
control P.C. board.
‡
Refer to 11-6. "Check
of LEV".
‡ Check the drain pump of
the indoor unit.
The communication between boards
protection cut-out operates 2
consecutive times.
Communication error occurs
between the electronic control P.C.
board and power board for more
than 10 seconds.
Current sensor protection cut-out
operates 2 consecutive times.
A short or open circuit is detected in
the current sensor during compressor
operating.
The protection cut-out of the zero cross
detecting circuit operates 10
consecutive times.
Zero cross signal cannot be detected
while the compressor is operating.
A failure is detected in the operation
of the converter during operation.
The bus-bar voltage exceeds 400 V or
falls to 200 V or below during
compressor operating.
The bus-bar voltage exceeds
400 V
(MXZ-3D54/3D68/4D72VA
MXZ-3D54VA2)
430 V (MXZ-4D83/5D102VA)
or falls to 50V or below during
compressor operating.
Communication error
between P.C. boards
Current sensor
Zero cross detecting circuit
Converter
Bus-bar voltage
(1)
Bus-bar voltage
(2)
Even if this protection stop is
performed continuously three
times, it does not mean the
abnormality in outdoor power
system.
LEV and drain pump
Lighted 6 times
Lighted 7 times
5 times Not
lighted
5 times Not
lighted
5 times
6 times
Not
lighted
Not
lighted
The indoor unit detects an abnormality
in the LEV and drain pump.
Lighted Lighted
Abnormal point
(Failure mode/protection)
Condition
Remedy
Indoor/outdoor
unit failure mode
recall function
LED indication
(Outdoor P.C. board)
LED 1 LED 2
Upper or left lamp of
OPERATION INDICATOR
lamp (Indoor unit)
NOTE
: Blinking patterns of this mode differ from the ones of "Troubleshooting check table" (11-4).
OBH626K