Mitsubishi Electric M-SERIES, Installation Manual

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105
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
- - -
2-time blink
Outdoor power system
Lit Lit
Overcurrent protection cut-out
operates 3 con-secutive times
within 1 minute after the com-
pressor gets started, or converter
protection cut-out or bus-bar
voltage protection cut-out
operates 3 consecutive times
within 3 minutes after startup.
• Check the connection of the
com-pressor connecting wire.
• Refer to 12-6.
“How to check inverter/
compres-sor”.
• Check the stop valve.
3-time blink
Discharge temperature thermistor Lit Once
A thermistor shorts or opens
during compressor running.
• Refer to 12-6. “Check of
outdoor thermistors”.
Defrost thermistor Lit Once
Ambient temperature thermistor Lit Twice
• Replace the outdoor control
P.C. board.
Fin temperature thermistor Lit 3 times
P.C. board temperature thermistor Lit 4 times
• Refer to 12-6. “Check of
outdoor thermistors”.
Outdoor heat exchanger temperature
thermistor
Lit 9 times
4-time blink Overcurrent Once Not lit
21 A current flows into power
module.
• Reconnect compressor
connector.
• Refer to 12-6. “How to check
in-verter/compressor”.
• Check the stop valve.
-
5-time blink Discharge temperature Lit Lit
The discharge temperature
exceeds 115°C during operation.
Compressor can restart
if discharge tempera-ture
thermistor reads 80°C or less 3
minutes later.
• Check refrigerant circuit and
refrig-erant amount.
• Refer to 12-6. “Check of
LEV”.
-
6-time blink High pressure Lit Lit
The outdoor heat exchanger
temperature ex-ceeds 70°C
during cooling or the indoor gas
pipe temperature exceeds 70°C
during heating.
• Check refrigerant circuit and
refrig-erant amount.
• Check the stop valve.
-
7-time blink
Fin temperature 3 times Not lit
The fin temperature exceeds
88°C during op-eration.
• Check around outdoor unit.
• Check outdoor unit air
passage.
• Refer to 12-6. “Check of
outdoor fan motor”.
-
P.C. board temperature 4 times Not lit
The P.C. board temperature
exceeds 67°C during operation.
8-time blink Outdoor fan motor Lit Lit
A failure occurs 3 consecutive
times within 30 seconds after the
fan gets started.
• Refer to 12-6. “Check of
outdoor fan motor”.
-
9-time blink Outdoor control system Lit 5 times
Nonvolatile memory data cannot
be read prop-erly.
• Replace the outdoor control
P.C. board.
10-time blink Low discharge temperature protection Lit Lit
The frequency of the compressor
is kept 80 Hz or more and the
discharge temperature is kept
under 39°C for more than 20
minutes.
• Check refrigerant circuit and
refrig-erant amount.
• Refer to 12-6. “Check of
LEV”.
-
MITSUBISHI ELECTRIC / DIAGNOSTIC
FAILURE MODE RECALL M SERIES - OUTDOOR UNIT - MULTISPLIT - 2 PORTS
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
LED 1 LED 2
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 re-
frigerant 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.
17 time blink Outdoor refrigerant system abnormality Lit 17 times
A closed valve and air trapped
in the refrigerant circuit are
detected based on the temperature
sensed by the indoor and outdoor
thermistors and the current of the
compressor.
• Check for a gas leak in a
connecting piping etc.
• Check the stop valve.
• Refer to 12-6. “Check of out-door
refrigerant circuit”.