Hi there, The Honeywell TC806B3010-IV is a discontinued model, and finding an exact replacement can be challenging. However, a viable alternative you can consider is the Fire-Lite FSP-951-IV. The FSP-951-IV is a compatible option that should work well in place of your TC806B3010-IV. Just make sure to check the wiring and compatibility to ensure a smooth transition. If you need further assistance or have any more questions, feel free to ask!