A:Answer Hi Barry, thank you for reaching out! If you ever need a replacement of your TH8321WF thermostat, it needs to be within its 5‑year warranty, which we can confirm using your proof of purchase. From there, our Tech Support team will guide you through a quick check. If the device is confirmed defective, we’ll provide a case number so Home Depot knows it was fully evaluated and can complete the replacement for you. If further questions arise, our technical support team is available and ready to assist. You can reach us 7 days a week via phone at 800.468.1502. We look forward to hearing from you.— Charlie
