Mitsubishi Electric MXZ-3C54VA Service Manual page 58
Outdoor unit
Hide thumbs
Also See for MXZ-3C54VA:
- Installation manual (14 pages) ,
- Service manual (396 pages) ,
- Service manual (302 pages)
Table of Contents
Advertisement
MXZ-6C
Upper or
left lamp of
OPERATION
Abnormal point
INDICATOR
(Failure mode/protection)
lamp (Indoor
unit)
11-time fl ash
Communication error between
P.C. boards
Current sensor
Zero cross detecting circuit
Bus-bar voltage
12-time fl ash
Compressor (open phase)
14-time fl ash
Power module
15-time fl ash
LEV and drain pump
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.
Operation start
Check the outdoor unit
LED indicator.
Both LED 1
and LED 2
are OFF.
Refer to 11-6.
"Check of power supply".
• Indoor unit
• COOL or
serial signal
HEAT
error
operation only
Refer to 11-6.
Refer to 11-6.
"How to
"Check of
check
R.V. coil".
miswiring and
serial signal
error".
LED indication
(Outdoor P.C. board)
Lighting
6 times
Communication error occurs between
the control P.C. board and power board
for more than 10 seconds.
The communication between boards
protection cut-out operates 2 consecu-
tive times.
Lighting
7 times
After the operation starts, a short or
open circuit is detected in the current
sensor when the compressor is not
operating.
Current sensor has been short or open
circuited for 120 seconds.
5 times
Goes out Zero cross signal cannot be detected
while the compressor is operating.
The protection cut-out of the zero cross
detecting circuit operates 10 consecu-
tive times.
6 times
Goes out The bus-bar voltage exceeds
400 V or falls to 300 V or below during
compressor operating.
10 times Goes out Waveform of compressor current is dis-
torted.
7 times
Goes out The overcurrent is detected when the
frequency of the compressor is 1 Hz or
less.
Lighting
Lighting The indoor unit detects any abnormali-
ties in the LEV and drain pump.
Both LED 1 and
LED 2 are lighting.
• 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".
Condition
• When cooling,
• When heating,
dew drops in the
room does not get
non-operating
warm.
indoor unit.
Refer to 11-6.
Check of
"How to check of
mispiping
inverter/compressor".
Check mispiping,
shortage of capacity
58
Indoor/
outdoor
unit failure
Remedy
function
• Check the connecting wire
between the outdoor control
P.C. board and power board.
• Replace the power board.
• Check the connecting wire
between outdoor control
P. C . b o a r d a n d p o w e r
board.
• Check the voltage of power
supply.
• Replace the outdoor control
P.C. board.
• Check the connection of
the compressor connecting
wire.
• Refer to 11-6.
" How to
check inverter/compressor.
• Refer to 11-6.
" How to
check inverter/compressor.
• Refer to 11-6.
"Check of
LEV".
• Check the drain pump of the
indoor unit.
LED 1 or LED 2
has blinked.
Refer to 11-4.
"Troubleshooting check table".
• When cooling,
room does not
cool.
Refer to 11-6.
"How to check
of inverter/
compressor".
mode
recall
—
○
—
○
—
○
—
—
—
—
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
