Mitsubishi Electric M Series Installation Manual page 108

MITSUBISHI ELECTRIC / DIAGNOSTIC
FAILURE MODE RECALL M SERIES
THE LEFT LAMP OF
OPERATION
INDICATOR LAMP (FAILURE MODE/PROTECTION)
(INDOOR UNIT)
OFF
Communication error between
11-time blink
Zero cross detecting circuit
14-time blink Refrigerant leakage (Sensor detection)
Refrigerant leakage (Sensor detection)
14-time blink
Incompatible unit combination
15-time blink
106
- OUTDOOR UNIT - MULTISPLIT - 3/4/5/6 PORTS
ABNORMAL POINT
(OUTDOOR P.C. BOARD)
None (Normal)
P.C. boards
Current sensor
5 times
Converter 5 times
5 times
Bus-bar voltage
LED INDICATION
CONDITION
LED 1 LED 2
Lit Lit
Communication error occurs
between the out-door control
P.C. board and outdoor power
P.C. board for more than 10
Lit 6 times
The communication between
boards protec-tion cut-out
operates 2 consecutive times.
A short or open circuit is detected
in the cur-rent sensor during
compressor operating.
Lit 7 times
Current sensor protection cut-out
operates 2 consecutive times.
Zero cross signal cannot be
detected while the compressor is
Not lit
The protection cut-out of the zero
cross detecting circuit operates
10 consecutive times.
A failure is detected in the
Not lit
operation of the converter during
The bus-bar voltage exceeds
Not lit
400 V or falls to low level during
compressor operating.
1.Refrigerant leaks from the
piping or the heat exchanger in
the indoor unit.
2.The following items are used
around the indoor unit.
• Spray (LP gas including Freon,
and whose main ingredient is
Lit Lit
propane and butane)
• Aerosol insecticide (including
• Air spray painting (including
dichlo-romethane)
• Charcoal (charcoal fire)
• Chemicals (such as ethanol)
The refrigerant sensor mounted
on the indoor unit does not work.
Lit Lit
The refrigerant sensor is not
connected properly or the wire
The indoor unit which is not
Lit 11 times
compatible with the outdoor unit
is connected.
The indoor unit detects an
Lit Lit
abnormality in the LEV and drain
REMEDY
- -
• Check the connecting wire
between outdoor control P.C.
seconds.
board and out-door power P.C.
board.
-
• Check the connecting wire
operating.
among outdoor control P.C.
board and out-door power P.C.
board.
• Check the voltage of power
supply.
• Replace the outdoor power
operation.
P.C. board.
• Check the voltage of power
supply.
• Replace the outdoor control
P.C. board.
• Turn off the power after the
indoor unit finishes its FAN
operation.
(The FAN operation continues
for 3 hours.)
• Check the indoor unit to detect
the part where refrigerant leaks.
• Repair the part where
ethanol) refrigerant leaks.
• Turn on the power again.
• Replace the refrigerant sensor
if the problem is not fixed.
• Connect the connector of the
refrig-erant sensor properly.
• Replace the refrigerant
sensor.
is broken.
• Replace the indoor unit with
the one which is compatible
with the outdoor unit.
• Refer to 12-6. "Check of
LEV".
• Check the drain pump of the
pump.
indoor unit.
INDOOR/
OUTDOOR
UNIT FAILURE
MODE RECALL
FUNCTION
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