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Magic Chef Gas Furnace wont stay on for longer then 15 minutes. Pilot goes out after the furnace turns off. It doesn't even reach the desired temp. Do I need to replace the valve or the line leadin

Magic Chef Gas Furnace wont stay on for longer then 15 minutes. Pilot goes out after the furnace turns off. It doesn't even reach the desired temp. Do I need to replace the valve or the line leading from the valve to the lite?

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  • Carlos Vazquez
    Carlos Vazquez Nov 13, 2014

    Also I have replaced the thermocouple twice now.

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  • 283 Answers

It is not the valve or the wire. Most likley it is the Temp Sensor. A cheap part that take a few minute to install.Search for "White-Rodgers 3L11160" part to see what it looks like. You will need to find the correct one for your model. Look Here. http://www.repairclinic.com
1 2 bimetal disc thermostat 3L11 160

Good luck

j

Posted on Nov 13, 2014

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Posted on Jan 02, 2017

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  • 53 Answers

SOURCE: My coleman floor furnace will not stay on

Have the thermocouple replaced, ensure the pilot flame is blue - not yellow, yellow indicates blockage in pilot

Posted on Oct 08, 2009

  • 79 Answers

SOURCE: My pilot keeps going out on the furnace. We lite

Check the pilot light size. Is it small and not surrounding the top 1/3 of the thermocouple? If it isn't then the pilot orfice is restricted or the pilot tube compression nut could be loose. The pilot gas adjustment screw may also need adjusting if this gas valve has one. These problems should only be addressed by an experienced service tech.

Posted on Nov 10, 2009

  • 15 Answers

SOURCE: Gas Furnace - residential -found furnace off - pilot light off -

check ur venting first make sure its not plugged

Posted on Jan 02, 2010

  • 4736 Answers

SOURCE: The pilot will light and

If this heater hasn't been cleaned annually, more than likely that's the problem. This is what you'll need to properly service the unit. A Phillips Head Screw Driver, A Vacuum Cleaner with a brush attachment and some canned compressed air (like you clean a computer with). Before starting, be sure the pilot control knob is in the OFF position and the unit is cool.

On the sides of the heater you will see several screws that need to be removed to access the inside of the heater cabinet. Remove those screws and carefully remove the front of the heater. Once that is removed, you'll have access to all the inner workings that need to be cleaned, This will also tell you how dusty and dirty the inside is. Take you vacuum with brush attachment and carefully clean all of the interior, as well as vacuuming the burner thoroughly. Once that is completed, look for the pilot light assembly. Looking at the pilot itself ... about 2/3rds of the way down the pilot from the tip where the flame comes out, you'll see a small hole in the side of the pilot. That's the Oxygen Depletion Sensor (ODS). Take the canned compressed air, attach the straw nozzle and place the straw nozzle just into that hole. Give it a quick blast of air and you'll be surprised what comes out the other side. After that, blow out the pilot tip. Try not to turn the can upside down while using it. If you feel comfortable that you have thoroughly clean the unit as directed ... try lighting the pilot and the burner briefly, before reassembling. If everything works as designed, you're back in business.

Keep in mind that Vent-Free Gas Space Heaters (That includes Vent-free gas Logs and/or fireplaces) use interior air for combustion, They're perfectly safe, but whatever floats in your household air (dust, dirt, pet air, spiders) goes into them and will clog them up. Therefore, they should be claened and serviced annually. A good time is in the fall, before firing up the heater for the winter heating season.

Posted on Jan 19, 2011

  • 5 Answers

SOURCE: Furnace Pilot Light Won't Stay Lit

Here is something similar that happened to me. I went through the same steps you went through and upon closer inspection, I found a spider had made a web inside the supply line only letting a small trickle of gas through. Have you verified there is nothing blocking the line?

Posted on Oct 02, 2012

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How long is the pilot flame? It could be you can move the thermocouple into the flame by making adjustments of the metal holder. If the flame is small, there is an adjustment for the piolet flow in the control module where you turn gas on and off and light the pilot. It should be labeled and usually has a cover that must be unscrewed to reveal the adjusting screw. Need a bright flash light to see what you're doing.

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I have a magic chef furnace, armstrong series if the pilot light and ignightor both work but the burners wont light is it possible the thermocuppler bad?


The thermocouple keeps the pilot light on. If the flame blows out it shuts off the gas to the pilot lite only the board that has the igniter on it supplies power to open the main burner as long as the igniter is operating. Sounds like the gas valve is nor working.

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Pilot and burner light then gas shut off model 7900


How many degrees before it reaches desired temp, does it shut off? A thermostat is designed to shut the furnace off a couple/ few degrees before it reaches set temp. It has what is called a heat anticipater, which shuts the burner down, and lets the blower use the remaining heat from the heat exchanger to bring it up to desired temp making it more efficient. If it is more than a few degrees, replace the thermostat. You can jump out the red and white wires to confirm the faulty thermostat. If by doing this, the furnace never shuts down, until you separate the red and white wires. That confirms a faulty thermostat. Hope this helps someone.

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Fasdfas


Does the furnace stays off?.
Furnace are ment to cycle on and off because of limits .If you set to 70 furnace would cycle several times before reaching that temperature.
Just make sure your filters are clean and you got proper return air flow because lack of air flow will cause furnace to shut off sooner than normal

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My furnace will not restart after it reaches the desired temp, then drops below that temp. The on light flashes


If this is a gas furnace, the thermocouple is one likely point of failure. It could also be a clogged pilot light jet.

Nov 18, 2009 | Heating & Cooling

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Heater won't heat very long


there isnt a pilot if it has jets , it has a Hot surface ignitor. you should see a glow and then the jets light , if its running for a few min it may be overheating, have you changed the filter recently? you should also have a flash code you can locate when the furnace shut off and is no longer doin what its supposed to look thru the bottom door peep hole and watch for a series of red flashes. if you remove the cover after retrieving the flash code there will be a chart on the inside of the cover that will tell you why the furnace is shutting off. by the way the model # you gave is for the A/C coil above the furnace, not the furnace.

Oct 10, 2009 | Heating & Cooling

1 Answer

Gas Furnace burner shuts off after a minute even with new sensor


BE AWARE THAT MAGIC CHEF IS NO LONGER IN BUSINESS!
In my experience a 20 year old Magic Chef probably has a bad heat exchanger which can cause carbon monoxide poisoning and can not be replaced since Magic Chef is not around any more!
Today’s furnaces are controlled by a computer which constantly monitors for problems. When it detects a problem it will shut off the burners. Depending on the problem and the specific furnace it will either “lock out” the furnace or cycle it through a purge (to rid it of un-burned gas and excess heat) and then attempt to re-start it. If the problem continues to occur then it will “lock out”. Depending on the problem and the furnace it may again attempt a re-start after several hours. In any case if the problem was not detected/caused by a sensor which requires a manual re-set, when the power to the computer is interrupted or the call for heat is interrupted the computer is reset and it will again attempt to re-start the furnace. The most common problems are:
· Low or lack of flame sense. Different furnaces use different methods to detect a flame – often these “flame sensors” become dirty and have to be cleaned (usually with sandpaper or steel wool).
· Bad igniter. (Doesn’t light at all).
· Clogged combustion air intake or exhaust.
· Clogged condensate drain. (90+% efficient furnaces).
This is not a complete list, only the most common!
Depending on where you live your HVAC system runs more than anything else you own (including your car). All furnace manufacturers “recommend” “regular maintenance” of your furnace. In fact, all that I am aware of state in their warranty that the warranty may be voided due to lack of “regular maintenance.” The industry has defined “regular maintenance” as yearly (in fact, some manufacturer’s warranties state yearly). Due to safety, liability, and the need for many other things to be checked, cleaned, and/or adjusted (2-page checklist where I work) to ensure safety and efficiency. Due to the large number of furnaces and the differences between them. Moreover, due to the terms of this site, I WILL NOT AND CAN NOT give you specific instructions on how to perform repairs on your furnace. I suggest that you contact a local, reputable, HVAC service company for (a tune up, preventive maintenance, general maintenance, yearly service call, general service, or whatever they call it).

While I may not have told you how to fix your furnace yourself, I have told you how to fix it. Please rate my answer.

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