Carrier 38VMA Series - Error Definition; Possible Causes

Error Definition:
Error
Detailed Definition
Green LED (Number of Flashes)
Red LED
Compressor module protection
L0: Error in compressor module
8
Light on for long time
L1: DC bus under-voltage protection
9
L2: DC bus over-voltage protection
10
L4: MCE fault / synchronization / closed
loop
12
L7: Phase lacking protection for 3-phase
lines U, V, W in compressor
15
L8: Protection for transient
variation >15Hz between the former
moment (2S) and the next moment
16
L9: Protection for setting speed
difference between transient variation
and actual operation >15Hz
17
Possible Causes:
• Improper heat transfer by ODU system
• Improper heat transfer by IPM, and IPM thermal protection
• Improper input voltage for power supply
• Improper connection for 3-phase U, V, W lines to compressor
• Damaged compressor module
• Damaged compressor
• Improper refrigerant charge in the system
Drive module of compressor
+15VDC
+15VDC
Terminals P,
N, U, V, W of IPM
Terminals P, N, U, V, W of IPM
69