Any HVAC guys out there?

T.G · 02-05-2012, 11:22 AM

Scott, my mid-90's Carrier furnace uses a hot surface ignitor to fire the pilot which in turn ignites the burners, so when you look at it, if you're not familiar with the parts, it might appear as if the pilot is out, when, in fact, it's not supposed to be on.

I'm not familiar with the Bryant designs but generally speaking, most modern furnaces have a self-diagnostic routine of some sort built into them where they will spin up fans, close power relays, actuate solenoids, etc all in sequence and you watch for or read your DVM to see what isn't working. If it's not outlined on a service diagram inside the access doors, you can use the exact model number of the furnace to find the manual online at the manufacturer and see how to trip the diagnostic and it's sequence timing. Depending on what that comes back with, take it from there.

Please remember to close the gas shut-off valve to the furnace before starting any diagnostic routines or service.

02-05-2012, 11:22 AM	#11
T.G Grrrrrr Join Date: Mar 2009 First Name: The Other Adam Posts: 15,559 Trading: (37)	Re: Any HVAC guys out there? Scott, my mid-90's Carrier furnace uses a hot surface ignitor to fire the pilot which in turn ignites the burners, so when you look at it, if you're not familiar with the parts, it might appear as if the pilot is out, when, in fact, it's not supposed to be on. I'm not familiar with the Bryant designs but generally speaking, most modern furnaces have a self-diagnostic routine of some sort built into them where they will spin up fans, close power relays, actuate solenoids, etc all in sequence and you watch for or read your DVM to see what isn't working. If it's not outlined on a service diagram inside the access doors, you can use the exact model number of the furnace to find the manual online at the manufacturer and see how to trip the diagnostic and it's sequence timing. Depending on what that comes back with, take it from there. Please remember to close the gas shut-off valve to the furnace before starting any diagnostic routines or service.