MCAC-VTSM-2016-10 R410A All DC Inverter Mini VRF
Troubleshooting 87
4.15 P6 indicates inverter module protection; H4 indicates P6 protection has occurred 3 times in 60
minutes. When an H4 error occurs, a manual system restart is required before the system can
resume operation. The cause of an xH4 error should be addressed promptly in order to avoid system
damage.
4.15.1 Specific error codes for H4 inverter module protection
The specific error codes L0, L1, L2, L4, L5, L7, L8 and L9 can be obtained from the inverter module LED
indicators. If an inverter module error has occurred, one of inverter module LED indicators is continuously on
and the other one of inverter module LED indicators flashes.
Inverter module LED indicators
Flashes 8 times and stops for 1 second, then repeats
L0 - Inverter module protection
Flashes 9 times and stops for 1 second, then repeats
L1 - DC bus low voltage protection
Flashes 10 times and stops for 1 second, then repeats
L2 - DC bus high voltage protection
Flashes 12 times and stops for 1 second, then repeats
Flashes 13 times and stops for 1 second, then repeats
L5 - Zero speed protection
Flashes 15 times and stops for 1 second, then repeats
L7 - Phase sequence error
Flashes 16 times and stops for 1 second, then repeats
L8 - Compressor frequency variation greater than 15Hz within
one second protection
Flashes 17 times and stops for 1 second, then repeats
L9 - Actual compressor frequency differs from target frequency
by more than 15Hz protection
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