I have a three year old Bryant furnace that will not light properly. Only two of the five gas (flame)outlets are lighting. I have to reset it for it to properly start. When only two flames light, the system shuts down and tries to restart itself again. After several attempts, it stops and the light starts blinking. I checked for proper wire connection and it's not dirty. Any help will be greatly appreciated.
COMMUNITY FORUM
The newer furnaces use a flame sensor to detect that the fire has indeed lit once the gas begins to flow, if no flame is sensed the control will shut off the burners. The flame sensor is a rod that sticks into the flames at the outlet of the burners usually on the firght side of the burner bracket. You can tell its the flame sensor because it only has one wire connected to it, it mounts to the burner bracket with one screw and the sensor has a porcelain body with a metal rod at the end.
It is usually mounted on the burner furthest away from the hot surface ignitor, if it uses hot surface ignition. Older furnaces use a sparkignition system, in which case the ignitor and the flame sensor could be mounted in the same location or may even be the same rod. If the flame does not travel down the burner brackets from one burner to the next--you may have stuff built up in the burner pilot cavity, that is preventing the burner from transfering the flames from one burner to the next.
IF the burners are long about 18-24 inches in length its an old furnace, if they are short shaped like a jet engine mount with a tube that has a spider web at the end, then the furnace is relatively newer and uses the ignition system I described. If they are the long type of burners I would not recomend you remove them yourself, because if they are the long type and you put them back improperly a small explosion could result.
It is usually mounted on the burner furthest away from the hot surface ignitor, if it uses hot surface ignition. Older furnaces use a sparkignition system, in which case the ignitor and the flame sensor could be mounted in the same location or may even be the same rod. If the flame does not travel down the burner brackets from one burner to the next--you may have stuff built up in the burner pilot cavity, that is preventing the burner from transfering the flames from one burner to the next.
IF the burners are long about 18-24 inches in length its an old furnace, if they are short shaped like a jet engine mount with a tube that has a spider web at the end, then the furnace is relatively newer and uses the ignition system I described. If they are the long type of burners I would not recomend you remove them yourself, because if they are the long type and you put them back improperly a small explosion could result.
