Will it definitely work properly after cleaning the interior of the drain trap?
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After the last cleaning of the steam trap, there was severe steam leakage during use; should it be replaced?
Is the assembly inside correct, and are there any particles still present?
It is necessary to check whether the internal components are damaged or have reached the end of their useful life
Check what type of drain is it: thermostatic, float-type, bulb-type, or bimetallic. The bimetallic type is adjustable. If it is of another type, it is also necessary to check whether there are any issues with its internal structure.
Just as in my experience, we used float balls, and after removing and cleaning them, there was severe air leakage.
It is possible that wear of the valve seat and valve core is to blame