There are 85 ACH return codes. Here are the 12 ACH Codes that you may experience, along with a short explanation for each code. Related ArticlesWhat is the Meaning of ACH Return Code R02 - Account closed?What are ACH Smart Retries?What Are the Ways in Which Treezpay Tries to Reduce ACH Returns?What are the Timeframes for Responding to ACH Returns and Taking Action?What is an ACH Return?