McQuay MWM Service Manual Book page 52

Inverter Outdoor Unit
Model
SLX 10/15/20/25C/CR
MSV 25/35A
MSX 20/25/30A/AR
Normal running / compressor running RED LED blinking
No. of Blinks
1
2
3
4
5
6
7
8
Compressor stopped RED LED blinking
No. of
Faulty Indication
Blinks
1 Outdoor ambient sensor error
2 Outdoor coil sensor error
Outdoor discharge sensor error /
3
compressor overheat
4 DC compressor feedback error
5 Communication error
6 Over current error
7 No load
8 Over / under voltage
9 DC compressor start failure
10 Cooling overload
11 Defrost
12 IPM protection
13 Read EEPROM error
14 Write EEPROM error
Blinking Indication
Normal running, with no limitation
Voltage limit
Cooling unit: outdoor coil temperature limit
Heating unit: indoor coil temperature limit
Total current limit
Discharge temperature limit
Cooling unit: indoor coil temperature limit
Indoor fan control
Outdoor frequency adjustment
No. of
Faulty Indication
Blinks
15 DC fan motor feedback error
16 AC peak current error
17 Outdoor suction sensor error
18 None
19 DC compressor speed control error
20 None
21 Outdoor suction pipe A sensor error
22 Outdoor suction pipe B sensor error
23 Outdoor suction pipe C sensor error
24 Outdoor suction pipe D sensor error
31 Communication error with indoor A
32 Communication error with indoor B
33 Communication error with indoor C
34 Communication error with indoor D
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