Mitsubishi Electric M-SERIES, Installation Manual

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106
FAILURE MODE RECALL M SERIES - OUTDOOR UNIT - MULTISPLIT - 3/4/5/6 PORTS
THE 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
LED 1 LED 2
OFF None (Normal) Lit Lit
- - -
11-time blink
Communication error between
P.C. boards
Lit 6 times
Communication error occurs
between the out-door control
P.C. board and outdoor power
P.C. board for more than 10
seconds.
• Check the connecting wire
between outdoor control P.C.
board and out-door power P.C.
board.
-
The communication between
boards protec-tion cut-out
operates 2 consecutive times.
Current sensor Lit 7 times
A short or open circuit is detected
in the cur-rent sensor during
compressor operating.
-
-
Current sensor protection cut-out
operates 2 consecutive times.
Zero cross detecting circuit 5 times Not lit
Zero cross signal cannot be
detected while the compressor is
operating.
• Check the connecting wire
among outdoor control P.C.
board and out-door power P.C.
board.
-
The protection cut-out of the zero
cross detecting circuit operates
10 consecutive times.
Converter 5 times Not lit
A failure is detected in the
operation of the converter during
operation.
• Check the voltage of power
supply.
• Replace the outdoor power
P.C. board.
-
Bus-bar voltage 5 times Not lit
The bus-bar voltage exceeds
400 V or falls to low level during
compressor operating.
• Check the voltage of power
supply.
• Replace the outdoor control
P.C. board.
14-time blink Refrigerant leakage (Sensor detection) Lit Lit
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
propane and butane)
• Aerosol insecticide (including
ethanol)
• Air spray painting (including
dichlo-romethane)
• Charcoal (charcoal fire)
• Chemicals (such as ethanol)
• 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
refrigerant leaks.
• Turn on the power again.
• Replace the refrigerant sensor
if the problem is not fixed.
14-time blink
Refrigerant leakage (Sensor detection) Lit Lit
The refrigerant sensor mounted
on the indoor unit does not work.
The refrigerant sensor is not
connected properly or the wire
is broken.
• Connect the connector of the
refrig-erant sensor properly.
• Replace the refrigerant
sensor.
Incompatible unit combination Lit 11 times
The indoor unit which is not
compatible with the outdoor unit
is connected.
• Replace the indoor unit with
the one which is compatible
with the outdoor unit.
15-time blink Lit Lit
The indoor unit detects an
abnormality in the LEV and drain
pump.
• Refer to 12-6. “Check of
LEV”.
• Check the drain pump of the
indoor unit.
-
MITSUBISHI ELECTRIC / DIAGNOSTIC