Hi - I have never come across a code 24 but in hind sight all codes from 17 - 32 are comm related errors ranging from one form or another and often due to mismatched components - noted as you have exchanged the controller module - these do look similar but the important code is the product number found on the sticker at rear of the machine - they represent the parts inserted into a particular range although it may say IWL15 or GWL12 but do have identical components under the hood if can follow me on this.
Sorry cannot be more useful - without actually seeing the machine i cannot be 100% certain as what is actually causing the error.
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