How To Turn On Honeywell Thermostat Pro SeriesHow To Turn On Honeywell Thermostat Pro Series May 20, 2021May 20, 2021| fkdtsoreangfkdtsoreang| 0 Comment | 6:24 am Before this, you could attempt to see if the battery door will open by pressing it down then. Lift the cover on the programmable thermostat. Thermostat rond, Henry Dreyfuss, 1953 View MoreView More