Bryant 345MAV048100ACKA furnace: I changed the rollout switch and it worked for a week then again the code came up...just blowing cool air. Hit the reset and is working 2 days now but driving me crazy not knowing what to look for before it goes out again. Any Ideas what I should check?? I hate intermitten problems!!
The unit may be overfiring. Or you may have a cracked or faulty heat exchanger. Carrier/Bryant had a large amount of them fail. Need to contact a Bryant dealer to find out if yours was one of that batch.
"Cut it twice and it is still too short".
Standard diagnostic fee....Varies by location. Warranty depends on cause of problem. Heat Exchanger would have (typically) up to 20yr PART warranty : NO LABOR.... Can call Bryant dealer and give model and serial to find out heat exchanger warranty.