Components that have cracks and corrosion have a look at the external components of the system.
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The most likely cause for a crack in the heat exchanger is corrosion.
Cracked heat exchanger oxygen reading rises while furnace is heating up at time 1 09 burners are on and blower is running.
The reaction between the combustion gas and metal over time may create this weakening of metal.
Corrosion because of reaction between the combustion gas and the metal often because of improper venting can also weaken the metal to the point where cracks form.
This trips a safety switch and shuts down the furnace.
Combustion gases leaking from a cracked heat exchanger can cause frequent headaches as well as flu like symptoms.
Combustion pollutants such as carbon monoxide nitrogen dioxide and sulfur dioxide can cause eye and nose irritation disorientation sleepiness and nausea.
The furnace heat exchanger is the one of the main components inside the gas furnace and it s used to transfer the heat from the gas burner to the warm air that s blown into your home.
The furnace usually sends the fumes out a flue but a crack can allow some to seep out.
A crack in your heat exchanger is no trivial matter.
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There could be a number of reasons why the fuel isn t being burned properly with one of them being that the heat exchanger has been cracked.
If the oxygen reading rises to abnormal levels once the lower turns on this is because the blower is pushing air into the combustion chamber through the crack in the heat exchanger.
Beware of an unethical technician who finds a crack with a camera on a furnace that seems to be running just fine.
A cracked heat exchanger allows air from the furnace blower to interfere with the flame causing it to flutter or even roll out.
Depending on the age of your furnace a cracked heat exchanger probably means you need a new system.
But the decision to repair or replace a heating unit can be difficult.
This is why it s something to watch out for in an old furnace.
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