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MCQUAY Service Guide Book
Inverter - X Outdoor Unit
Model
MLCX 10/15/20/25C/CR
MMSV 25/35A
AMSX 20/25/30A/AR
Normal running / compressor running RED LED blinking
No. of Blinks
Blinking Indication
1
Normal running, with no limitation
2
Voltage limit
Cooling unit: outdoor coil temperature limit
3
Heating unit: indoor coil temperature limit
4
Total current limit
5
Discharge temperature limit
6
Cooling unit: indoor coil temperature limit
7
Indoor fan control
8
Outdoor frequency adjustment
Compressor stopped Error Indication
No. of Blinks
Faulty Indication
Red
Yellow
0
1
Outdoor ambient sensor error
0
2
Outdoor coil sensor error
Outdoor discharge sensor error
0
3
/ compressor overheat
0
4
DC compressor feedback error
0
5
Communication error
0
6
Over current error
0
7
No load
0
8
Over / under voltage
0
9
DC compressor start failure
1
0
Cooling overload
1
1
Defrost
1
2
IPM protection
1
3
Read EEPROM error
1
4
Write EEPROM error
Board
VB2.0
VB2.0
VB2.0
No. of Blinks
Red
1
1
1
1
1
2
2
2
2
2
3
3
3
3
58
Faulty Indication
Yellow
5
DC fan motor feedback error
6
AC peak current error
7
Outdoor suction sensor error
8
None
9
DC compressor speed control error
0
None
1
Outdoor suction pipe A sensor error
2
Outdoor suction pipe B sensor error
3
Outdoor suction pipe C sensor error
4
Outdoor suction pipe D sensor error
1
Communication error with indoor A
2
Communication error with indoor B
3
Communication error with indoor C
4
Communication error with indoor D
Diagnosis
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