Hello! It means that somewhere the air conditioner "flows" to the case, and quite strongly, therefore, the selectivity of the RCD operation is not ensured, also check the RCD of the group where the air conditioner is connected. The leakage current can be in another place - in the wires, at the connection, etc. For the sake of experiment, try connecting the air conditioner through an extension cord from an outlet that is connected to a machine of another group, if any, or from an outlet that is closer to the input. If the situation is the same, there is a 90% chance that the problem is in the air conditioner.
The next step is at least to check the resistance between the terminals of the plug and the case of the air conditioner with a multimeter. Or between the power terminals of a plug and a grounding prong. Although such measurements are carried out with a megohmmeter with a measurement voltage at least equal to the rated voltage of the tested circuits. The nominal resistance is conventionally taken at 1 megohm per 1 kV, for more details see PUE-7 1.8.34 and further.
By the way, in the off state of the air conditioner, such measurements may not give any results, because the motor circuit will actually be broken. If you can do it yourself, check the motors and circuit elements themselves when the block is disassembled, i.e. "on the wires".
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