Mitsubishi Electric MXZ-2C30VA, Руководство по обслуживанию

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Operation start
Check the outdoor unit
LED indicator.
Refer to 11-6.
"Check of power supply".
• When cooling,
dew drops in the
non-operating
indoor unit.
Check of
mispiping
• Indoor unit
serial signal
error
Refer to 11-6.
"How to
check
miswiring and
serial signal
error".
• COOL or
HEAT
operation only
Refer to 11-6.
"Check of
R.V. coil".
• When cooling,
room does not
cool.
Refer to 11-6.
"How to check
of inverter/
compressor".
• When cooling, heat
exchanger of
non-operating indoor
unit frosts.
•When heating, non-
operating indoor unit
gets warm.
Refer to 11-6.
"Check of LEV".
• When heating,
room does not get
warm.
Refer to 11-6.
"How to check of
inverter/compressor".
Check mispiping,
shortage of capacity
Refer to 11-4.
"Troubleshooting check table".
Both LED 1 and
LED 2 are lighting.
LED 1 or LED 2
has blinked.
Both LED 1
and LED 2
are OFF.
11-3. INSTRUCTION OF TROUBLESHOOTING
• Check the indoor unit by referring to the indoor unit service manual, and confirm whether there is any problem in the indoor
unit. Then, check the outdoor unit by referring to this page.
MXZ-6C
Upper or
left lamp of
OPERATION
INDICATOR
lamp (Indoor
unit)
Abnormal point
(Failure mode/protection)
LED indication
(Outdoor P.C. board)
Condition Remedy
Indoor/
outdoor
unit failure
mode
recall
function
11-time fl ash Communication error between
P.C. boards Lighted 6 times Communication error occurs between the
control P.C. board
(MXZ-6C120VA)
/outdoor
control P.C. board
(MXZ-6C122VA)
and
power board
(MXZ-6C120VA)
/outdoor
power P.C. board
(MXZ-6C122VA)
for more
than 10 seconds.
• Check the connecting wire
between the control P.C. board
(MXZ-6C120VA)
/outdoor con-
trol P.C. board
(MXZ-6C122VA)
and the power board
(MXZ-
6C120VA)
/outdoor power P.C.
board
(MXZ-6C122VA)
.
—
The communication between boards
protection cut-out operates 2 consecutive
times.
○
Current sensor Lighted 7 times After the operation starts, a short or open
circuit is detected in the current sensor
when the compressor is not operating. • Replace the power board
(MXZ-6C120VA)
/outdoor pow-
er P.C. board
(MXZ-6C122VA)
.
—
Current sensor has been short or open
circuited for 120 seconds.
○
Zero cross detecting circuit 5 times Not
lighted
Zero cross signal cannot be detected while
the compressor is operating. • Check the connecting wire
between control P.C. board
(MXZ-6C120VA)
/outdoor con-
trol P.C. board
(MXZ-6C122VA)
and the power board
(MXZ-
6C120VA)
/outdoor power P.C.
board
(MXZ-6C122VA)
.
—
The protection cut-out of the zero cross de-
tecting circuit operates 3 consecutive times.
○
Bus-bar voltage 6 times Not
lighted
The bus-bar voltage exceeds
400 V or falls to 300 V or below during
compressor operating. • Check the voltage of power
supply.
• Replace the power board
(MXZ-6C120VA)
/outdoor pow-
er P.C. board
(MXZ-6C122VA)
.
—
12-time fl ash Compressor (open phase) 10 times Not
lighted
Waveform of compressor current is dis-
torted. • Check the connection of the
compressor connecting wire.
• Refer to 11-6. " How to check
inverter/compressor.
—
14-time fl ash Power module 7 times Not
lighted
The overcurrent is detected when the fre-
quency of the compressor is 1 Hz or less. • Refer to 11-6. " How to check
inverter/compressor.
—
15-time fl ash LEV and drain pump Lighted Lighted The indoor unit detects an abnormality in
the LEV and drain pump.
• Refer to 11-6. "Check of
LEV".
• Check the drain pump of the
indoor unit.
—
OBH584G