|
Simular Bryant Problem
Whacker,
I have a mid 90's Bryant +90 natural gas furnace. I recently experienced a similar issue to which you have described. When the thermostat would call for heat the furnace vacuum motor would come on followed by the thermo igniter. Once the igniter would get hot "orange" I could hear the gas valve click and turn on and what I think is the sound of gas flowing. However, after about 8 seconds no combustion would occur and the gas valve would shut off. The furnace would retry 2 more times and then shut down in a lockout mode for 3 hours.
The problem with my unit was in the gas valve. Even though the valve would turn on there was insufficient gas flow sometimes. I ended up removing the brass plug on the gas valve and turning "in" the flame adjustment to let more gas into the combustion chamber. If you try this you need to be careful to not turn it up too high or else the thermo switch will trip stop the unit from turning on until it is manually rest.
I hope this helps,
|