Mitsubishi Electric Mr. Slim SUZ-SA71VA, Техническое и сервисное руководство

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15 15
SUZ-SA71VA.TH
temperature thermistor, outdoor heat exchanger temperature
No. Symptoms
Abnormal point/
Condition
Remedy Condition
1
Outdoor unit
does not op-
erate.
1-time flash
every
2.5 seconds
Outdoor power sys-
tem
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Reconnect connector of compres-
sor.
Refer to 11-5. "How to check in-
verter/compressor".
Check stop valve.
•
•
•
2
Outdoor thermistors Discharge temperature thermistor shorts, or opens during
compressor running.
defrost thermistor, P.C. board
thermistor or ambient temperature thermistor shorts, or opens
during compressor running.
Refer to 11-5.
F
"Check of outdoor
thermistors".
•
3
Outdoor control sys-
tem
Nonvolatile memory data cannot be read properly. Replace inverter P.C. board. •
4
6-time flash
2.5 seconds
OFF
Serial signal The communication fails between the indoor and outdoor unit
for 3 minutes.
5
11-time flash
2.5 seconds
OFF
Stop valve/
Closed valve
Closed valve is detected by compressor current. Check stop valve.
•
6
•
7
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated.
2-time flash
2.5 seconds OFF
Overcurrent protec-
tion
Large current flows into intelligent power module. Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
Check stop valve.
•
•
•
8
3-time flash
2.5 seconds OFF
Discharge tempera-
ture overheat pro-
tection
Temperature of discharge temperature thermistor exceeds
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
Check refrigerant circuit and refrig-
erant amount.
Refer to 11-5. "Check of LEV".
•
•
9
4-time flash
2.5 seconds OFF
Fin temperature
/P.C. board tem-
perature thermistor
overheat protection
Temperature of fin temperature thermistor on the heat sink
exceeds 72 to 86 °C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 72 to 85°C.
Check around outdoor unit.
Check outdoor unit air passage.
Refer to 11-5. "Check of outdoor
fan motor".
•
•
•
10
5-time flash
2.5 seconds OFF
High pressure pro-
tection
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
Check refrigerant circuit and refrig-
erant amount.
Check stop valve.
•
•
11
8-time flash
2.5 seconds OFF
Compressor syn-
chronous abnormal-
ity
The waveform of compressor current is distorted. Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
•
•
12
10-time flash
2.5 seconds OFF
Outdoor fan motor Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
Refer to 11-5. "Check of outdoor
fan motor.
Refer to 11-5. "Check of inverter
P.C. board.
•
•
13
12-time flash
2.5 seconds OFF
Each phase current
of compressor
Each phase current of compressor cannot be detected nor-
mally.
Refer to 11-5. "How to check in-
verter/compressor".
•
14
13-time flash
2.5 seconds OFF
DC voltage DC voltage of inverter cannot be detected normally. Refer to 11-5. "How to check in-
verter/compressor".
•
15
Outdoor unit
operates.
1-time flash
2.5 seconds OFF
Frequency drop by
current protection
When the input current exceeds approximately 16A, 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.
•
•
•
16
3-time flash
2.5 seconds OFF
Frequency drop by
high pressure pro-
tection
Temperature of indoor coil thermistor exceeds 55°C in HEAT
mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL
mode
Indoor coil thermistor reads 8°C or less in COOL mode, com-
pressor frequency lowers.
17
4-time flash
2.5 seconds OFF
Frequency drop by
discharge tempera-
ture protection
Temperature of discharge temperature thermistor exceeds
111°C, compressor frequency lowers.
Check refrigerant circuit and refrig-
erant amount.
Refer to 11-5. "Check of LEV".
Refer to 11-5. "Check of outdoor
thermistors".
•
•
•
18
19
7-time flash
2.5 seconds OFF
Low discharge tem-
perature protection
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
Refer to 11-5. "Check of LEV".
Check refrigerant circuit and refrig-
erant amount.
•
•
8-time flash
2.5 seconds OFF
This is not malfunction. PAM pro-
tection will be activated in the fol-
lowing cases:
1. Instantaneous power voltage
drop. (Short time power failure)
2. When the power supply voltage
is high.
9-time flash
2.5 seconds OFF
Inverter check mode The connector of compressor is disconnected, inverter check
mode starts.
Check if the connector of the com-
pressor is correctly connected.
Refer to 11-5. "How to check
inverter/compressor".
•
Note: 1. The location of LED is illustrated at the right figure. Refer to “11-6. Test point diagram and voltage”.
2. LED is lighted during normal operation.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
ON
OFF
2.5-second OFF
2.5-second OFF
0.5-second ON
0.5-second ON
LED
Flashing →
Inverter P.C. board
•
I
H
H
J
I
F
I
•
Check of indoor/outdoor connecting
wire.
Replace indoor or outdoor P.C.
board if abnormality is displayed
again.
Zero cross detecting
circuit
Zero cross signal for PAM control cannot be detected.
LED
indication
check
code
UP
U3
U4
FC
E8
E9
UE
Fin temperature thermistor,
/
frequency lowers.
11-2. TROUBLE SHOOTING CHECk TABLE
OCH561