V6R VRF 50Hz
106
Midea
V
6R
Series S
er
vice M
anual
2.14
H4: Compressor inverter module protection
Digital display output
Description
All units stop running.
Error code is displayed on the unit with the error.
Trigger / recover condition
Trigger condition: Compressor appears three inverter module protections.
Recover condition: Inverter module goes back to normal.
Reset method: Manually restart.
Possible causes
Inverter module protection.
DC bus low or high voltage protection.
Zero speed protection.
Phase sequence error.
Excessive compressor frequency variation.
PED software verification failed.
Specific error codes for H4 inverter module protection
If an H4 error code is displayed, enter menu mode “n31” (refer to Part 5, 2.2.3 “menu mode”) to check the history error
code. Specific error code: L0, L1, L2, L5, L7, LA. can be obtained. If 3 times of L0 to LA protection occurs within 1 hour, H4
protection will appear on the digital tube of main board or spot check board.
Table 6-2.1: Specific error codes for error H4
Specific error code
1
Content
L0
Inverter compressor module error
L1
DC bus low voltage protection
L2
DC bus high voltage protection
L5
Zero speed protection
L7
Phase sequence error
LA
PED software verification failed
