Mitsubishi Electric MXZ-2HA40VF2-E1 Service Manual page 55

MXZ-3HA
Indication
No. Symptom
LED1(Red) LED2(Yellow)
1 Outdoor
Lit
unit does
not operate.
2
Lit
3
Lit
4
Lit
5
Lit
6
Lit
7
Lit
8
Lit
9
Lit
10
Lit
11
Lit
12
Lit
13 Lit
14
Lit
15 'Outdoor unit
stops and
restarts
Twice
3 minutes
later' is
repeated.
16
3 times
17
4 times
18
5 times
19
6 times
20
8 times
21
9 times
22
11 times
OBH828D
Abnormal point / Con-
dition
Once LEV and drain pump
Outdoor power
Twice
system
Discharge temperature
3 times
thermistor
Fin temperature
thermistor
4 times
P. C. board tempera-
ture thermistor
Ambient temperature
thermistor
Outdoor heat ex-
changer temperature
5 times
thermistor
Defrost thermistor
Zero cross detecting
6 times circuit (Outdoor control
P.C. board)
7 times Outdoor control system
8 times Current sensor
Communication error
between P.C. boards
11 times
M-NET communication
error
Zero cross detecting
12 times circuit (Outdoor power
P.C. board)
13 times Current sensor
14 times Voltage sensor
15 times Relay operation
21 times 4-way valve
IPM protection
Not lit
Lock protection
Discharge temperature
Not lit
protection
Fin temperature
protection
Not lit
P.C. board temperature
protection
High pressure
Not lit
protection
Not lit Pre-heating protection
Not lit Converter protection
Bus-bar voltage
Not lit
protection
Low outside tempera-
Not lit
ture protection(cooling)
Condition
The indoor unit detects an abnormality in the LEV
and drain pump.
Overcurrent protection cut-out operates 3 consecu-
tive times within 1 minute after the compressor
gets started, or converter protection cut-out or bus-
bar voltage protection cut-out operates 3 consecu-
tive times within 3 minutes after startup.
A short circuit is detected in the thermistor during
operation, or an open circuit is detected in the ther-
mistor after 10 minutes of compressor startup.
A short or open circuit is detected in the thermistor
during operation.
A short or open circuit is detected in the thermistor
during operation.
A short circuit is detected in the thermistor during
operation, or an open circuit is detected in the ther-
mistor after 5 minutes (in cooling) and 10 minutes
(in heating) of compressor startup.
A short circuit is detected in the thermistor during
operation, or an open circuit is detected in the ther-
mistor after 5 minutes of compressor startup.
Zero cross signal cannot be detected.
The nonvolatile memory data cannot be read
properly.
Current sensor protection cut-out operates 2 con-
secutive times.
The communication protection cut-out between
boards operates 2 consecutive times.
M-NET adapter P.C. board detects an abnormality
in the communication error.
The protection cut-out of the zero cross detecting
circuit operates 10 consecutive times.
A short or open circuit is detected in the input cur-
rent detection circuit during operation.
A short or open circuit is detected in the input volt-
age detection circuit during operation.
No relay operation is detected during operation.
Connector of R.V. coil is disconnected, poorly con-
nected or 4-way valve is faulty.
Overcurrent is detected after 30 seconds of com-
pressor startup.
Overcurrent is detected within 30 seconds of com-
pressor startup.
The discharge temperature exceeds 115°C during
operation.
Compressor can restart if discharge temperature
thermistor reads 80°C or less 3 minutes later.
The fin temperature exceeds during operation.
The P.C. board temperature exceeds during opera-
tion.
High pressure is detected with the high pressure
switch (HPS) during operation.
The outdoor heat exchanger temperature exceeds
70°C during cooling or the indoor gas pipe tem-
perature exceeds 70°C during heating.
Overcurrent is detected during pre-heating.
A failure is detected in the operation of the convert-
er during operation.
The bus-bar voltage exceeds 400 V or falls to low
level during compressor operating.
The ambient became -12°C or less.
55
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.
• Refer to 12-6. "Check of R.V. coil".
• Check the 4-way valve.
• 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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