H4: Compressor Inverter Module Protection; Specific Error Codes For H4 Inverter Module Protection - Midea VRF Series Service Manual

V6R VRF 50/60Hz

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
L0
L1
L2
L5
L7
LA
106
Inverter compressor module error
DC bus low voltage protection
DC bus high voltage protection
Zero speed protection
Phase sequence error
PED software verification failed
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