How To Reset Honeywell Thermostat Pro Series T4. Bring a thermometer into the room where your thermostat is (make sure the thermometer is accurate). Press and hold the button under the symbol and the button together until the display changes (approx.

Honeywell 1 2450rc/2450rch/2455rc series automatic reset thermostat if you want to turn your home into a smart home, a connected thermostat is. Notice if there is any difference in the two readings and compute the difference (offset). Press the button under the symbol until 16:fs is displayed.