Mitsubishi Electric M Series Installation Manual page 107

FAILURE MODE RECALL M SERIES
UPPER OR LEFT LAMP
OF OPERATION
INDICATOR LAMP (FAILURE MODE/PROTECTION)
(INDOOR UNIT)
Refrigerant leakage (Sensor detection)
14-time blink
Incompatible unit combination
17 time blink
Outdoor refrigerant system abnormality
FAILURE MODE RECALL M SERIES
THE LEFT LAMP OF
OPERATION
INDICATOR LAMP (FAILURE MODE/PROTECTION)
(INDOOR UNIT)
OFF
2-time blink
Discharge temperature thermistor
Ambient temperature thermistor
3-time blink
Fin temperature thermistor
P.C. board temperature thermistor
Outdoor heat exchanger temperature
4-time blink
5-time blink
Discharge temperature
6-time blink
7-time blink
P.C. board temperature
8-time blink
9-time blink Outdoor control system
10-time blink Low discharge temperature protection
- OUTDOOR UNIT - MULTISPLIT - 2 PORTS
ABNORMAL POINT
- OUTDOOR UNIT - MULTISPLIT - 3/4/5/6 PORTS
ABNORMAL POINT
(OUTDOOR P.C. BOARD)
None (Normal)
Outdoor power system
Defrost thermistor
thermistor
Overcurrent
High pressure
Fin temperature
Outdoor fan motor
LED INDICATION
(OUTDOOR P.C.
CONDITION
BOARD)
LED 1 LED 2
The refrigerant sensor mounted on
the indoor unit does not work.
Lit Lit
The refrigerant sensor is not
connected properly or the wire is
broken.
The indoor unit which is not
Lit 11 times
compatible with the outdoor unit is
connected.
A closed valve and air trapped
in the refrigerant circuit are
detected based on the temperature
Lit 17 times
sensed by the indoor and outdoor
thermistors and the current of the
compressor.
LED INDICATION
LED 1 LED 2
Lit Lit
Overcurrent protection cut-out
operates 3 con-secutive times
within 1 minute after the com-
pressor gets started, or converter
Lit Lit
protection cut-out or bus-bar
voltage protection cut-out
operates 3 consecutive times
within 3 minutes after startup.
Lit Once
Lit Once
Lit Twice
A thermistor shorts or opens
during compressor running.
Lit 3 times
Lit 4 times
Lit 9 times
21 A current flows into power
Once Not lit
The discharge temperature
exceeds 115°C during operation.
Compressor can restart
Lit Lit
if discharge tempera-ture
thermistor reads 80°C or less 3
The outdoor heat exchanger
temperature ex-ceeds 70°C
Lit Lit
during cooling or the indoor gas
pipe temperature exceeds 70°C
during heating.
The fin temperature exceeds
3 times Not lit
88°C during op-eration.
The P.C. board temperature
4 times Not lit
exceeds 67°C during operation.
A failure occurs 3 consecutive
Lit Lit
times within 30 seconds after the
fan gets started.
Nonvolatile memory data cannot
Lit 5 times
be read prop-erly.
The frequency of the compressor
is kept 80 Hz or more and the
Lit Lit
discharge temperature is kept
under 39°C for more than 20
MITSUBISHI ELECTRIC / DIAGNOSTIC
REMEDY
• Connect the connector of the re-
frigerant sensor properly.
• Replace the refrigerant sensor.
• Replace the indoor unit with the
one which is compatible with the
outdoor unit.
• Check for a gas leak in a
connecting piping etc.
• Check the stop valve.
• Refer to 12-6. "Check of out-door
refrigerant circuit".
CONDITION REMEDY
-
• Check the connection of the
com-pressor connecting wire.
• Refer to 12-6.
"How to check inverter/
compres-sor".
• Check the stop valve.
• Refer to 12-6. "Check of
outdoor thermistors".
• Replace the outdoor control
P.C. board.
• Refer to 12-6. "Check of
outdoor thermistors".
• Reconnect compressor
connector.
• Refer to 12-6. "How to check
module.
in-verter/compressor".
• Check the stop valve.
• Check refrigerant circuit and
refrig-erant amount.
• Refer to 12-6. "Check of
LEV".
minutes later.
• Check refrigerant circuit and
refrig-erant amount.
• Check the stop valve.
• Check around outdoor unit.
• Check outdoor unit air
passage.
• Refer to 12-6. "Check of
outdoor fan motor".
• Refer to 12-6. "Check of
outdoor fan motor".
• Replace the outdoor control
P.C. board.
• Check refrigerant circuit and
refrig-erant amount.
• Refer to 12-6. "Check of
LEV".
minutes.
INDOOR/
OUTDOOR
UNIT FAILURE
MODE RECALL
FUNCTION
INDOOR/
OUTDOOR
UNIT FAILURE
MODE RECALL
FUNCTION
- -
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105