Carrier 38VMH-1P Service Manual page 53

:
L0~L9 OR H4: COMPRESSOR MODULE PROTECTION
DEFINITION
Error
Compressor module protection
H4: L0 or L1 errors happen for three times in 60 seconds. The unit will stop and requires recycling power to restart.
POSSIBLE CAUSES
• ODU system in poor heat dissipation
• IPM in poor heat dissipation
• Improper power supply
• Damaged compressor module in power drive board
• Burnt compressor
• Improper refrigerant in the system
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Detailed Definition
L0: Error in compressor module
L1: DC bus under-voltage protection
L2: DC bus over-voltage protection
L4: Compressor MCE error
L8: Compressor speed difference between set
and run is more than 15 rps
L9: Compressor speed difference is more than
15 rps in one second
Fig. 60 —L0~L9 Troubleshooting Chart
Number of Flashing Times for Green LED
8
9
10
12
16
17
A210298
53
Red LED
Light on constantly