Mitsubishi Electric MXZ-2HA40VF-E1 Service Manual page 48

MXZ-3HA
Indication
No. Symptom
LED1(Red) LED2(Yellow)
1 Outdoor
Lit
unit does
not operate.
2
Lit
3
Lit 3 times
4
Lit 4 times
5
Lit 5 times
6
Lit 6 times
7
Lit 7 times
8
Lit 8 times
9
Lit 11 times
10
Lit 12 times
11
Lit 13 times
12
Lit 14 times
13 Lit 15 times
14 'Outdoor unit
stops and
restarts
Twice
3 minutes
later' is
repeated.
15
3 times
16
4 times
17
5 times
18
6 times
19
8 times
20
9 times Not lit
21
11 times Not lit
OBH828B
Abnormal point / Con-
dition
The indoor unit detects an abnormality in the LEV
Once LEV and drain pump
and drain pump.
Overcurrent protection cut-out operates 3 consecu-
tive times within 1 minute after the compressor
Outdoor power
Twice gets started, or converter protection cut-out or bus-
system
bar voltage protection cut-out operates 3 consecu-
tive times within 3 minutes after startup.
A short circuit is detected in the thermistor during
Discharge temperature
operation, or an open circuit is detected in the ther-
thermistor
mistor after 10 minutes of compressor startup.
Fin temperature
thermistor
A short or open circuit is detected in the thermistor
during operation.
P. C. board tempera-
ture thermistor
Ambient temperature A short or open circuit is detected in the thermistor
thermistor during operation.
A short circuit is detected in the thermistor during
Outdoor heat ex-
operation, or an open circuit is detected in the ther-
changer temperature
mistor after 5 minutes (in cooling) and 10 minutes
thermistor
(in heating) of compressor startup.
A short circuit is detected in the thermistor during
Defrost thermistor operation, or an open circuit is detected in the ther-
mistor after 5 minutes of compressor startup.
Zero cross detecting
circuit (Outdoor control Zero cross signal cannot be detected.
P.C. board)
The nonvolatile memory data cannot be read
Outdoor control system
properly.
Current sensor protection cut-out operates 2 con-
Current sensor
secutive times.
Communication error The communication protection cut-out between
between P.C. boards boards operates 2 consecutive times.
M-NET communication M-NET adapter P.C. board detects an abnormality
error in the communication error.
Zero cross detecting
The protection cut-out of the zero cross detecting
circuit (Outdoor power
circuit operates 10 consecutive times.
P.C. board)
A short or open circuit is detected in the input cur-
Current sensor
rent detection circuit during operation.
A short or open circuit is detected in the input volt-
Voltage sensor
age detection circuit during operation.
Relay operation No relay operation is detected during operation.
Overcurrent is detected after 30 seconds of com-
IPM protection
pressor startup.
Not lit
Overcurrent is detected within 30 seconds of com-
Lock protection
pressor startup.
The discharge temperature exceeds 115°C during
Discharge temperature operation.
Not lit
protection Compressor can restart if discharge temperature
thermistor reads 80°C or less 3 minutes later.
Fin temperature
The fin temperature exceeds during operation.
protection
Not lit
P.C. board temperature The P.C. board temperature exceeds during opera-
protection tion.
High pressure is detected with the high pressure
switch (HPS) during operation.
High pressure
Not lit
The outdoor heat exchanger temperature exceeds
protection
70°C during cooling or the indoor gas pipe tem-
perature exceeds 70°C during heating.
Not lit Pre-heating protection Overcurrent is detected during pre-heating.
A failure is detected in the operation of the convert-
Not lit Converter protection
er during operation.
Bus-bar voltage The bus-bar voltage exceeds 400 V or falls to low
protection level during compressor operating.
Low outside tempera-
The ambient became -12°C or less.
ture protection(cooling)
Condition
48
Remedy
• Refer to 12-6. "Check of LEV".
• Check the drain pump of the indoor unit.
• Check the connection of the compressor connect-
ing wire.
• Refer to 12-6. "How to check inverter/compres-
sor".
• Check the stop valve.
• Refer to 12-6. "Check of outdoor thermistors".
• Refer to 12-6. "Check of outdoor thermistors".
• Replace the outdoor control P.C. board.
• Refer to 12-6. "Check of outdoor thermistors".
• Replace the outdoor control P.C. board.
• Replace the outdoor control P.C. board.
• Replace the outdoor power P.C. board.
• Check the connecting wire between outdoor con-
trol P.C. board and outdoor power P.C. board.
• Check the connecting wire between M-NET
adapter P.C. board and outdoor control P.C.
board, or terminal block.
• Replace the outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Replace the outdoor power P.C. board.
• Reconnect compressor connector.
• Refer to 12-6. "How to check inverter/
compressor".
• Check the stop valve.
• Check the power module (PAM module).
• Check the amount of gas and refrigerant circuit.
• Refer to 12-6. "Check of LEV".
•Check refrigerant circuit and refrigerant amount.
•Refer to 12-6. "Check of outdoor fan motor".
• Check around of gas and the refrigerant circuit.
• Check the stop valve.
• Reconnect compressor connector.
• Refer to 12-6. "How to check inverter/
compressor".
• Check the power module.
• Replace the outdoor power P.C. board.
• Check the voltage of power supply.
• Replace the outdoor power P.C. board or the out-
door control P.C. board.
• Refer to 12-6. "Check of bus-bar voltage".
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