Gas Furnace Vent Pipe Blocked

The pressure switch can also be tripped by an obstructed exhaust flue gas vent pipe.

Gas furnace vent pipe blocked. Now let s look at the top signs to look for which may mean a vent is clogged. If your furnace is having problems with starting or seems to be trying to start but doesn t blocked airflow from the intake pipe is a common. Similar to an obstructed air intake pipe check for obstructions such as nests or leaves but also check for inadequate sloping of the vent pipe and make sure the exhaust pipe is supported every 5 feet of its horizontal run. If you see rust or water streaking on the vent flue or on your chimney something may be blocking the flue.

Gas furnaces build up scale which forms when gas byproducts and moisture combine and these can block the flue. Failure to ignite caused by clogged flue vent. To work properly a furnace needs adequate airflow. Over time the furnace exhaust vent can become clogged with.

Gas and oil furnace have a vent pipe or flue that sends the gaseous by products of combustion to the outdoors. How to clean and clear furnace exhaust vents. Depending on the type of furnace venting takes place through a plastic pipe on the outside of the house or through the chimney.