I have an Empire rh. It's rear vented. Runs on natural gas. Was installed in 09 and ran great until last year when eco started cutting out. So I jumped the switch and ordered a new switch. When I installed same problem so I jumped it for all last year. This year I replaced again and it cut out again so right now it's jumped. What's the issue? The switch is good but for some reason it's getting activated. The room where the space heater is in has 2 CO detectors that have never bleeped so there is no CO. It's Installed in the 2 nd floor of a 100 year old building. The flue is shared with a Nat gas furnace that's in the basement. New tenants keep the house real warm could that do it? Also I noticed that when the "repair man" switched out the first ECO switch, he went down to the basement and cleaned out the bottom of the flue. There was some dirt and debris in there. But he left the plate off the bottom. I remember he said that leaving the plate off would give a batter draft. Now that I think about it I'm not sure if that's true. I'm thinking of a flue like a big vacuum pipe, and If you leave one big opening at the bottom I think there would be less suction at the places where you need it most, like the exhaust to the heater. What do you think? Also, Can I keep the ECO jumped?