Delta Support Hello, I’m reporting a defective unit. Order: #REDACTED Product: Delta Electronics DTB4848RR temperature/process controller (DigiKey P/N DTB4848RR-ND), 100-240 VAC The controller was installed and running for about one month in a simple application, driving an appropriately rated solid-state relay. The display then went completely dark and the unit is totally dead: no display, no LEDs, no response of any kind. Supply voltage at the terminals is correct. One month of service seems far too short for this type of controller, so I believe it is a manufacturing defect. Could you please open an RMA and arrange a replacement under warranty? Let me know if you need photos, the installation details, or anything else. P.S. I’m reporting this here, in this group therapy session, because I couldn’t find any other way to request support. 
Thank you,
When I tried to submit the return, I got this error: “Product not eligible for return due to age of invoice (25-May-2026/AUTO).”
I understand the standard return window is counted from the invoice date. However, the controller was only put into service about one month before it failed, so this is a defect, not a regular return. It should still be covered by Delta’s manufacturer warranty.
Could you please process this as a warranty claim with Delta, or let me know the correct way to contact Delta directly for a replacement?