Midea MHC-V22W/D2RN8 - Page 69

M thermal Mono
68 202008
Midea M thermal Mono
Service Manual
4.20 Inverter module Troubleshooting
Digital display output 4.20.1
Description 4.20.2
Inverter module protection or high pressure protection.
M thermal Mono stops running.
Specific error code L0, L1, L2, L4, L5, L8 , L9 is displayed on the user interface and the refrigerant system main PCB.
Possible causes 4.20.3
Inverter module protection.
DC bus low or high voltage protection.
MCE error(DC bus low or high voltage protection or software over current protection)
Zero speed protection.
Excessive compressor frequency variation.
Actual compressor frequency differs from target frequency.
High pressure protection.
Contactor stuck or 908 self checking fail.
Specific error codes for inverter module protection 4.20.4
Table 4-4.1: Specific error codes
Specific error code Content
L0 Inverter module protection
L1 DC bus low voltage protection
L2 DC bus high voltage protection
L4 MCE error(DC bus low or high voltage protection or software over current protection)
L5 Zero speed protection
L8 Compressor frequency variation greater than 15Hz within one second protection
L9 Actual compressor frequency differs from target frequency by more than 15Hz protection
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