Fanuc OT alarm codes are not available for download from the company website as of 2016. However, the company provides a Customer Portal, including an e-store, where parts and technical documents are available for purchase after registering with the company and going through a verification process.
Access to Fanuc alarm codes, including OT alarm codes, is available from alternate websites such as HelmanCNC and Pennine Automation Spares. HelmanCNC provides a list of Fanuc alarm codes that link to an expanded definition of the reason for the error message. Pennine Automation Spares provides alarm codes based on general system problems, and after clicking the link on the general problem area, the website displays a list of more detailed alarm codes.