Outdoor Led Indication Table - Mitsubishi Electric Mr.Slim MSZ09UN Service Manual

(Outdoor LED indication table)

MUZ09UN
MUZ12UN
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation.
No.
Symptom LED indication
1-time flash every
Outdoor unit
2.5 seconds
1
does not
NOTE:
operate
For abnormality
location, refer to
'Indoor
troubleshooting
2
check table' on
page 43.
3
'Outdoor unit 2-time flash
4
2.5 seconds OFF
stops and
restarts 3
3-time flash
minutes later'
2.5 seconds OFF
is repeated
5
4-time flash
2.5 seconds OFF
6
5-time flash
2.5 seconds OFF
7
Outdoor unit
1-time flash
8
operates
2-5 seconds OFF
(at low
3-time flash
frequency)
2-5 seconds OFF
9
4-time flash
2-5 seconds OFF
10
Outdoor unit
6-time flash
11 operates
2-5 seconds OFF
7-time flash
2-5 seconds OFF
12
9-time flash
2-5 seconds OFF
13
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
Abnormal point
Outdoor power
When compressor has stopped by over current protection
system
within 1 minute after compressor start-up 3 times in a row,
compressor stops and then restarts 3 minutes later.
MUZ09UN
Outdoor
When discharge temperature thermistor, defrost thermistor or
thermistors
fin temperature thermistor shorts or opens during compressor
running, compressor stops and restarts 3 minutes later.
MUZ12UN
When discharge temperature thermistor, defrost thermistor or
fin temperature thermistor shorts or opens during compressor
running, compressor stops.
Outdoor control When nonvolatile memory date cannot be read properly,
system compressor stops and restarts 3 minutes later.
Overcurrent When 29A current flows into IPM, compressor stops and
protection restarts 3 minutes later.
Discharge
When discharge temperature thermistor exceeds 241°F,
temperature compressor stops and restarts 3 minutes later.
overheat (Compressor restarts when discharge temperature thermistor
protection
reads 212°F or below.)
When temperature at heat sink exceeds 182°F or outdoor
Fin temperature
electronic control P.C. board exceeds 172°F, compressor stops
thermistor overheat
and restarts 3 minutes later.
protection
High pressure When indoor coil thermistor exceeds 167°F, compressor stops
protection and restarts 3 minutes later.
Frequency drop by When current from power outlet exceeds 9A, compressor
current protection frequency lowers.
Frequency drop by When indoor coil thermistor exceeds 131°F in HEAT mode,
high pressure compressor frequency lowers.
protection
Frequency drop by When indoor coil thermistor reads 43°F or below in COOL
defrosting in COOL mode, compressor frequency lowers.
mode
Frequency drop by, When discharge temperature thermistor exceeds 232°F,
discharge compressor frequency lowers.
temperature
protection.
Power factor When power factor of compressor is not detected.
w In this case, compressor continues running.
detection
Low discharge
When discharge temperature has been 122°F or below for 20
temperature
minutes.
protection
inverter check
When connector of compressor disconnect, inverter check
mode
mode starts.
2.5-second OFF
Detection method
0.5-second ON
2.5-second OFF
44
<Outdoor electronic control P.C. board>
Transistor Hybrid
module IC
transformer
Checkpoint
· Refer to A 'How to check inverter/
compressor' on page 47.
· Refer to J 'Check of outdoor
thermistors' on page 51.
Replace outdoor electronic control
P.C. board.
Refer to A 'How to check inverter/
compressor on page 47.
· Check refrigerant circuit and
refrigerant amount.
· Refer to J 'Check of outdoor
thermistors' on page 51.
· Check around outdoor unit.
· Check outdoor unit air passage.
· Check refrigerant circuit and
refrigerant amount.
· Check stop valve.
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
outlets are short cycled.
Check compressor wiring.
· Refer to O 'Check of LEV' on
page 54.
· Check refrigerant circuit and
refrigerant amount.
· Check if connector is connected.
· Refer to A 'How to check inverter/
compressor on page 47.
0.5-second ON
LED
flashing