1. In which area you live and ambient temperatures you usually experience. [B]Missouri, 20f to 110f[/B] 2. House style and construction details. [B]Two story wood frame[/B] 3. Make, model and age of equipment related to the problem. [B]Frigidaire G6RK072C-12 80+ [/B] 4. Fuel type. [B]Natural Gas Furnace[/B] 5. Water temperature and pressures of boiler systems. [B]N/A[/B] 6. What type of zoning do you have with your boiler system. [B]N/A[/B] 7. Thermostat type. [B]Hunter Fans model: 44155[/B] 7. Anything else that would be useful. No detail is to small. The more information you provide the easier it becomes for the professionals in this forum to determined the cause and correction to the problem. [B]See bellow[/B] Previous Post: [url]http://www.doityourself.com/forum/gas-oil-home-heating-furnaces/461970-pressure-switch-stuck-closed.html[/url] Started December 12th with the furnace not lighting, so I checked the thermostat and found a broken solder connection on it. I replaced the thermostat with the Hunter Fans model: 44155. The issue was not resolved, so I replaced the control board and then the fan would not run, so I replaced the run capacitor. Now here is the issue: When I replaced the control board in the furnace I found a resistor marked - Dale CW-10 270ohm 5% Mexico M9806, on the part of the control board where you clamp down the wires coming from the thermostat in the house. I carefully labeled all of the wires before removing them from the control board so I knew exactly where to put them on the new control board and on a piece of paper I wrote which terminals to connect the resistor back up to. [B]Now I can not find that piece of paper![/B] So what terminals should this resistor be hooked up to? I am almost sure that one end was connected to the W on the board but without that sheet of paper I can't be sure, and I do not remember at all where the other end went. Also there is no mention of this resistor in the paper work that came with the new control board or the furnace service manual? So why is it even there? Is it necessary?

Recently purchased a home in Washington State. The house has a Trane upright right Heating/ AC unit. The unit is located in the garage. Right off the main supply trunk is a 8" duck that leads across the ceiling of the garage right to a vent to the outside. I have never seen this before. Why would there be a supply duct going straight outside? The duct does have a damper valve on it, which i closed. My only thoughts was during the spring / fall time you could run the fan to force outside air to come into the house. But why would the duct work be insulated? Thanks John