Translations:KAVAN Smart PRO SBEC ESCs - Instruction manual/125/en
From KAVAN RC Wiki
Low Voltage (UL): the battery voltage got below the threshold specified in the battery protection menu and the controller either reduced the maximum power or shut down the motor completely.
High voltage (UH): in case you use a weak battery or wall power supply, the voltage might rise above the initial level during braking. In such a case, the alarm is set and all braking functions are disabled.
High current (IH): the current got higher than the maximum peak current defined in the product specification (120 A for KAVAN Smart PRO 85).
High temperature (T100, T110, T120): the temperature got above the safety threshold level. The numerical value specifies the maximum detected temperature and safety protocol which has been applied.
Commutation error (COM): a synchronization error has been detected during the motor operation. It usually occurs when the motor stops abruptly, or in case of very fast acceleration for some specific setups. This error could mean a serious issue in the motor-controller installation.