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11-4. Troubleshooting check table
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
2. LED is lighted during normal operation.
Symptom
No.
LED indication
1-time flash every
Outdoor unit
2.5 seconds
does not
1
operate
2
3
6-time flash
4
2.5 seconds OFF
14-time flash
5
2.5 seconds OFF
2-time flash
'Outdoor unit
2.5 seconds OFF
stops and
6
restarts 3
minutes later'
is repeated
3-time flash
2.5 seconds OFF
7
4-time flash
2.5 seconds OFF
8
5-time flash
2.5 seconds OFF
9
8-time flash
2.5 seconds OFF
10
10-time flash
2.5 seconds OFF
11
12-time flash
12
2.5 seconds OFF
13-time flash
2.5 seconds OFF
13
1-time flash
Outdoor unit
2.5 seconds OFF
14
operates
3-time flash
2.5 seconds OFF
15
4-time flash
2.5 seconds OFF
16
Outdoor unit
7-time flash
17
operates
2.5 seconds OFF
8-time flash
2.5 seconds OFF
18
9-time flash
2.5 seconds OFF
19
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is "2".
Abnormal point/ Condition
When it consecutively occurs 3 times that the compressor stops
Outdoor power
for overcurrent protection within 1minute after start-up.
system
When discharge temperature thermistor, fin temperature
Outdoor
thermistor, defrost thermistor, P.C. board temperature
thermistors
thermistor or ambient temperature thermistor shorts or opens
during compressor running.
When nonvolatile memory data cannot be read properly.
Outdoor control
system
(When
lights up or flashes 7-time.)
When the communication fails between the indoor and outdoor
Serial signal
unit for 3 minutes.
Outdoor unit
When outdoor unit is defective.
(Other abnormality)
Overcurrent
When 14A(MUZ-GA25VA,MUZ-GA25VAH)/ 24A(MUZ-GA35VA,
protection
MUZ-GA35VAH) current flows into intelligent power module.
Discharge
When temperature of discharge temperature thermistor
temperature
exceeds 116:, compressor stops. Compressor can restart if
overheat
discharge temperature thermistor reads 100: or less 3
protection
minutes later.
Fin temperature
When temperature of fin temperature thermistor on the heat
/P.C. board
sink exceeds 82:(MUZ-GA25VA,MUZ-GA25VAH)/ 83:
temperature
(MUZ-GA35VA,MUZ-GA35VAH) or temperature of P.C. board
thermistor
temperature thermistor on the inverter P.C.board exceeds
overheat protection
81:(MUZ-GA25VA,MUZ-GA25VAH)/ 85:(MUZ-GA35VA,
MUZ-GA35VAH).
When indoor coil thermistor exceeds 70: in HEAT mode.
High pressure
When the defrost thermistor exceeds 70: in COOL mode.
protection
Compressor
When the waveform of compressor current is distorted.
synchronous
abnormality
Outdoor fan motor
When outdoor fan has stopped 3 times in a row within 30
seconds after outdoor fan start-up.
Each phase
When each phase current of compressor cannot be detected
current of
normally
compressor
DC voltage
When DC voltage of inverter cannot be detected normally.
Frequency drop by
When current from power outlet exceeds 5.2A(MUZ-GA25VA,
current protection
MUZ-GA25VAH)/ 6.1A(MUZ-GA35VA,MUZ-GA35VAH),
compressor frequency lowers.
Frequency drop by
When temperature of indoor coil thermistor exceeds 55: in
high pressure
HEAT mode, compressor frequency lowers.
protection
Frequency drop by
When indoor coil thermistor reads 8: or less in COOL mode,
defrosting in COOL
compressor frequency lowers.
mode
Frequency drop by
When temperature of discharge temperature thermistor
discharge
exceeds 111:, compressor frequency lowers.
temperature
protection
Low discharge
When temperature of discharge temperature thermistor has
temperature
been 50: or less for 20 minutes.
protection
When the overcurrent flows into IGBT(Insulated Gate Bipolar
PAM protection
transistor : TR821) or when the bus-bar voltage reaches 320V
or more, PAM stops and restarts.
PAM:
Pulse
Amplitude
Modulation
When the connector of compressor is disconnected, inverter
Inverter check
check mode starts.
mode
ON
2.5-second OFF
OFF
Condition
the left lamp of OPERATION INDICATOR lamp
0.5-second ON
2.5-second OFF
37
Inverter P.C. board (Parts side)
Flashing
Correspondence
· Check stop valve.
· Reconnect connector of compressor.
· Refer to 11-6.A "How to check
inverter/ compressor".
· Refer to 11-6.G "Check of outdoor
thermistors".
Replace inverter P.C. board.
of the indoor unit
Refer to 11-6.O "How to check mis-
wiring and serial signal error".
Refer to 11-2.2. Flow chart of the
detailed outdoor unit failure mode
recall function.
· Check stop valve.
· Reconnect connector of compressor.
· Refer to 11-6.A "How to check
inverter/compressor".
· Check refrigerant circuit and
refrigerant amount.
· Refer to 11-6.L "Check of LEV".
· Check around outdoor unit.
· Check outdoor unit air passage.
· Refer to 11-6.I "Check of outdoor
fan motor".
· Check refrigerant circuit and
refrigerant amount.
· Check stop valve.
· Reconnect connector of compressor.
· Refer to 11-6.A "How to check
inverter/compressor".
· Refer to 11-6.I "Check of outdoor
fan motor".
· Refer to 11-6.N "Check of inverter
P.C. board".
· Refer to 11-6.A "How to check
inverter/compressor".
· Refer to 11-6.A "How to check
inverter/compressor".
The unit is normal, but check the
following.
· Check if indoor filters are clogged.
· Check if refrigerant is short.
· Check if indoor/outdoor unit air
circulation is short cycled.
· Check refrigerant circuit and
refrigerant amount.
· Refer to 11-6.L "Check of LEV".
· Refer to 11-6.G "Check of
outdoor thermistors".
· Refer to 11-6.L "Check of LEV".
· Check refrigerant circuit and
refrigerant amount.
This is not malfunction.
PAM protection will be activated in
the following cases;
1Instantaneous power voltage drop
(Short time power failure)
2When the power supply voltage is
high.
Check if the connector of the
compressor is correctly connected.
Refer to 11-6.A "How to check
inverter/ compressor".
0.5-second ON
LED
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