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Bryant 3 wire pilot won't hold

5K views 11 replies 2 participants last post by  kenmac 
#1 ·
I have a Bryant 376BAW036075 that the burners won't ignite. It is a 1989 vintage furnace. This is what is happening.

1. thermostat calls for heat
2. inducer motor comes on
3. ignitor starts to spark
4. pilot ignites and burns and then it extinguishes
5. ignitor sparks
6. pilot ignites and burns and then extinguishes
7. Main burner valve never opens

This sequence continues indefinetly. I have replaced the three wire pilot and the gas valve and also the inducer motor control board. Nothing I do changes the above sequence.
 
#8 ·
It does have a bi metal switch in the pilot . When it gets hot enough it makes up and applies 24v to the gv. but if it goes out b-4 it gets hot enough to make the connection it won't open the gv. It senses flame back through the plug wire. The sensor wire or the board is bad. You might try to clean the sensor or the wire where it connects to the board
 
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