This reset Honeywell thermostat old model routine erases all user changed settings. Resetting also removes lock screen passwords and screen color changes et al. Resetting restores this Honeywell RTH9580WF touchscreen thermostat to factory default condition. You Reset by following the routine below. We suggest this action when fixing common issues as well. Why? Because Resetting … Continue reading How to Reset Honeywell Thermostat Old Model