Mitsubishi Electric MXZ-2C30VA Service Manual page 89

Upper or left lamp of
Abnormal point
OPERATION INDICATOR
(Failure mode/protection)
lamp (Indoor unit)
Communication error
11-time flash
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.
15-time flash LEV and drain pump
NOTE: Blinking patterns of this mode differ from the ones of "Troubleshooting check table" (11-4).
OBH584G
LED indication
(Outdoor P.C. board) Condition
LED 1 LED 2
Communication error occurs
Lighted 6 times
between the electronic control P.C.
board and power board for more
than 10 seconds.
The communication between boards
protection cut-out operates 2
consecutive times.
Lighted 7 times A short or open circuit is detected in
the current sensor during compressor
operating.
Current sensor protection cut-out
operates 2 consecutive times.
5 times Not
Zero cross signal cannot be detected
lighted
while the compressor is operating.
The protection cut-out of the zero cross
detecting circuit operates 10
consecutive times.
5 times
Not A failure is detected in the operation
lighted of the converter during operation.
5 times
Not
The bus-bar voltage exceeds 400 V or
lighted
falls to 200 V or below during
compressor operating.
6 times
Not
The bus-bar voltage exceeds
lighted
400 V (MXZ-3C54/3C68/4C71VA)
430 V (MXZ-4C80/5C100VA, 4C80/5C100VA2)
or falls to 50 V or below during
compressor operating.
Lighted Lighted
The indoor unit detects an abnormality
in the LEV and drain pump.
89
Indoor/outdoor
Remedy
unit failure mode
recall function
• Check the connecting
wire between electronic
control P.C. board and
the power board.
• Replace the power
board.
• Check the connecting
wire between electronic
control P.C. board,
noise filter P.C. board
and the power board.
• Check the voltage of
power supply.
• Replace the power board.
• Check the voltage of
power supply.
• Replace the electronic
control P.C. board.
• Refer to 11-6. "Check
of LEV".
• Check the drain pump of
the indoor unit.