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Cracked heat exchanger

How does failure to derate gas fired furnace lead to heat exchanger cracking. Would not inadequate O2 result in lower flame temperature and CO production?

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  • Dayton Master
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Co2 would enter the room and not go up the flue , flame would burn floppy , or go out , derate I take it too much gas would not give correct flame picture too much gas to burn lack of air etc.

Posted on Oct 28, 2012

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Posted on Jan 02, 2017

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Therinnaiguy
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SOURCE: replaced cracked heat exchanger on Goodman gas

It may help if you increased the blower speed. It sounds like you have a restriction in either the return air duct or in the heat exchanger. Does it help to open the blower door panel. If so, you have confirmed a restriction. How do the burners look? Are they good and blue or yellow? Are the correct orifices being used for the type of gas? I know I am asking more questions than you, but it may help us with the answers. Good luck to you Wade.

Posted on Jan 31, 2010

  • 224 Answers

SOURCE: Furnace is 5+ years old (warranty ends 5 years)

Well yes and no. Let me explain, you can buy a replacement heat exchanger, or possibly get in touch with the manufacturer and customer service. Express your discontent nicely about the product and warranty and they just may send you an exchanger. I have been successful doing this with a high end television. Weigh the expense of replacement exchanger verses replacing entire furnace, then go with the best option. Sorry to hear about your luck it just does not seem right that at five years this should happen.

Posted on Dec 22, 2010

  • 182 Answers

SOURCE: I have a 5 year gas furnace emitting CO. Heat

It's hard to say how long it would take to change the exchanger. It all depends on how much access they have all the way around the unit. I have changed them in outdoor units in about 4 hours by myself. but I have changed them on indoor units in about a day with a helper. The part it self does not cost a lot compared to a new unit but unless you are able to find cheep labor then a new unit might cost about the same. If you can find someone to do it for a set price rather then an hourly company then you will at least be able to compare new against repair.hope this helps..

Posted on Dec 28, 2010

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My furnace is a Rheem has issues of pilot light not staying lite the flame blows out won't stay on long enough to heat house


First thing I do, especially if the furnace is an older one, is to light a match or long end lighter(like for BBQ pits), hold it inside the opening on the front of the furnace heat exchanger, where you would normally see the burner flames, then turn on the fan only. If you see the "flame dance/flame disturbance", then that furnace may be unsafe due to a cracked heat exchanger. Holes or cracks in heat exchanger will blow out the pilot by allowing the air that we breathe to enter the heat exchanger and mix with the combustion process. AND may cause carbon monoxide poisoning. In that scenario, I would call in a professional. Now if it's not a heat exchanger issue, the flue pipe may have a back draft issue. Again, call a professional! Play it safe with that issue. Hope this helps!

Mar 14, 2017 | Heating & Cooling

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Why do I always have to hit the restart button to make my furnace run


not sure exactly what you have or what button you are pressing but if you have a gas fired furnace and you are pressing the little buttons inside the furnace to get it to run, then you should stop doing that and have a pro come out and inspect it. Furnaces have limits inside them that will trip when they get to hot. In the case of a gas fired furnace a cracked heat exchanger can allow the flame to come outside the firebox, which will trip the limit which is a safety device. Limits only trip if something is wrong. They do not operate in normal operation. A cracked heat exchanger will allow carbon monoxide in the house which can kill you. That is why limits are installed to protect you. if your furnace is over 10 years old this could be the case.

Sep 10, 2014 | Heating & Cooling

1 Answer

Dayton gas furnace model 3e385 works and lights but as soon as fan comes on the unit shuts off and lights again wondering what was wrong


Check heat exchanger for cracks or holes which will cause the fan to blow out the flames. The flame sensor on the pilot or burners has to be in constant contact with flame to operate normally. If the flame is put out by a cracked exchanger the exchanger or furnace needs to be replaced.

Nov 22, 2011 | Dayton Gas Furnace Heater

1 Answer

Flame goes out after releasing the red button.


most likely a thermocouple. it is a small copper "wire" that screws into the gas valve/regulator and the other end inserts into the pilot assembly. Available at any hardware store for >$5. How ever I strongly advise you have a professional address you furnace simply due to the safety issues that an un-trained eye will miss. Such as a cracked heat exchanger which could result in carbon monoxide poison infiltrating the home.

Dec 14, 2010 | Heating & Cooling

1 Answer

Rollout switch continues to trip


If you have a cracked heat exchanger this will cause the flames to rollout and trip this switch. Its meant to stop the furnace from running and putting carbon monoxide in your home. Watch the furnace as it tries to light if when the gas valve opens and flame is established it should go into the tubes heat the heat exchanger and then your main blower motor will come on. When your main blower comes on is usually when you see the flames rollout and trip that switch. If this happens you can either buy a heat exchanger or new furnace if its a older unit Obama still has that awesome tax credit til 12-31-2010.

Dec 13, 2010 | Goodman Heating & Cooling

2 Answers

I have a goodman gmnt 100 b furnace 2 stage when the gave valve turns on and floods the heat exchanger with flame then the squirl cage fan turns on and i loose the the flame


If you are getting flame distortion when the blower comes on it usually means a cracked heat exchanger which can lead to carbon monoxide, get your furnace checked by a qualified tech..

Jan 31, 2010 | Goodman Furnace Draft Inducer Blower ...

1 Answer

Flame drops when blower comes on suspect bad heat exchanger


Are you saying you lose the pilot flame or the main burner flame? A cracked heat exchanger will cause a "venturi effect" when the blower cycles on. This effect will cause blower to interfere with combustion air and **** out the pilot, and cause lifting of the main burner flames (also add oxygen to the flames changing their color).

Some of your newer style furnaces will kick the hi limit when they have a crack in the exchanger dropping the flame and bringing the blower on.

If you are pretty confident of a crack I would suggest a water test.....After the furnace has cooled. determine which way will most easily access the heat exchanger through the top (under the a-coil) from the "plenium". or from below by removing the blower with it's housing.

once you have determined your approach get a bug sprayer and put water in it. With the heat exchanger cool, use the wand of the sprayer to liberally spray the top of the exchanger. If there is a crack the water will find its way into it. Take a flashlight and look into the bottom of each burner slot, if you see water, you have a crack, shut it down and replace it.

Dec 26, 2009 | Coleman Propane Forced Air Heater...

1 Answer

Burner flame going out on windy days on Coleman Evcon LP furnace


This sounds like a bad heat exchanger. It is possible that you do not see the crack because the crack is closed when the heat exchanger is cold (or room temp). Allow the furnace to heat up, this will allow the expansion of the crack. Turn the power off and examine the heat exchanger while it is still hot.

Mar 31, 2009 | Coleman Propane Forced Air Heater...

1 Answer

My Whirlpool furnace (WFCU125D20-1A) is not working. The indicator light is blinking 3 times meaning presure switch. This has hapened in the past.


1.when you turn off power to the unit and retry with power after two minutes does the unit fire up and is there blue flames or is it more white or yellow This could be a blocked intake or exhaust vent also gas pressure could be fluctuating from another gas appliance firing. 2. does the flame jump when the main fan turns on this could be a cracked heat exchanger which is the part where the flame blows in. let me know if this help

Jan 10, 2009 | Heating & Cooling

2 Answers

I have a Coleman/Evcon Presidential ser# 074878. The plumber says the Heat exchanger is cracked. Is this something I can fix myself or is it less expenxive to buy a new furnace?


The heat exchanger is a bear to change. depending on the age of the unit it might be more practical to replace the unit. However unless you trust this service tech I'd get a second opinion, because it is rare that a heat exchanger will crack, plus by law he or she should have shut the furnace down do to carbonminoxde. Especially rare in Coleman Evcon series units.

Oct 21, 2008 | Heating & Cooling

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