When trying to change the range on the DR232 expandable hybrid recorder, error code 004 "Channels set incorrectly" appears.

In the user's manual, see Displaying information set in the modules (MODULE INF) in section 9.4, "Clearing Alarm/Message Buffers, Displaying Module/Communications Information, Structuring System Modules, and Initializing Information," and check whether the module information is being recognized correctly. If the module information is not correct, execute a system restructuring (RE SYSTEM).
DR232/DR242 User's Manual