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Heat exchanger failures
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Carbon monoxide in furnaces
The heat exchangers in fuel furnaces can crack or rust thru. When this happens several things may happen.
One, the burner flame may rollout the front of the furnace when the circulating fan comes on. This is because there is no barrier between the burner flame and the air circulating they the furnace. Obviously the is is a fire hazard.
Two, the burner flame may be upset so the gas does not completely burn.
Three, the incomplete burn may produce carbon monoxide that may get into the circulating air, causing a poisoning hazard. The video below covers how to check for CO in the air supplied to the conditioned space.
One, the burner flame may rollout the front of the furnace when the circulating fan comes on. This is because there is no barrier between the burner flame and the air circulating they the furnace. Obviously the is is a fire hazard.
Two, the burner flame may be upset so the gas does not completely burn.
Three, the incomplete burn may produce carbon monoxide that may get into the circulating air, causing a poisoning hazard. The video below covers how to check for CO in the air supplied to the conditioned space.
Among the reasons for heat exchanger failure is overfire of the burner. The video below shows the effects of this problem.
The Goodman (Janitrol) GMP model gas furnace had a large number of heat exchanger problems. A broken heat exchanger can cause flame failure and dangerous CO gas in the structure. The video below demonstrates how to determine if the heat exchanger has failed.
The heat exchanger above fails by breaking the rivets that hold the 2 halves of the clamshell heat exchanger together. The video below shows this condition.
The video below covers a recall of Carrier, Bryant and Payne for a secondary heat exchanger rust out problem. A list of model #s is included in the video. I would not call this list definitive, but it gives a start on how to deal with this problem. The video will be available 2-24-15.
Below is a problem with the Carrier 398AAW model gas furnace.
The video below covers a plugged heat exchanger and the effects this has on the burners. Unless the furnace has protection such as rollout switches, the rollout can cause a fire in the house.
Under construction