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