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Coleman h 90 gas furnace will not start up when thermostat is turned up

Gas flow is good and Pilot is remaining lit with strong flame Changed thermo-coupler and cleaned pilot areas and burners(3 burners) Checked fan and electrical - All is working properly- Fan starts when turned on Also replaced thermostat When thermostat is turned up the burners will not start up - suspect that natural gas is not being fed to the burners although a continuous gas flow is being fed to the pilot

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  • Heating & Co... Master
  • 2,557 Answers

The gas valve is not lifting hence no gas flow , check pressure switch if fitted jump out thermostat see if it lights ,

Posted on Jan 11, 2013

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Posted on Jan 02, 2017

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SOURCE: coleman 90% gas furnace control board stolen

make sure high voltage wiring is correct

Posted on Jan 19, 2009

  • 75 Answers

SOURCE: pilot lites; but, as soon as I turn on gas flame

sounds like your thermacouplar is going out and needs replaced. Sometimes these will act like they are working fine , but when the pilot stays on for awhile and later goes out it is a sure sign that it is bad

Posted on Nov 08, 2009

heatman101
  • 43501 Answers

SOURCE: Coleman Gravity Floor Furnace need millivolt gas valve & pilot ki

Go to www.grainger.com and look for a "power pile generator" this is a millivolt thermocouple that may be just what you need to make your heater work again

Posted on Nov 12, 2009

  • 221 Answers

SOURCE: The pilot light will not stay lit, I was told

Hi, this heater doesn't have a thermocouple, it uses a pilot generator which is more reliable so I doubt you need to change it out. First thing to check is that you have a clean "sharp" blue pilot, you should be able to hear it quietly roar. If it is yellow and appears "soft", the pilot need to be cleaned. The easiest way is to use a straw or tubing of some sort to blow into the pilot, gently tapping the pilot assembly. That should clean it up and heat the pilot generator properly. Tighten the the screw terminals at the control valve to assure good electrical connections and last but not least turn off the thermostat until you get a standing pilot. Good luck and stay warm.

Posted on Jan 13, 2010

  • 207 Answers

SOURCE: Brivis Buffalo pilot on but unit not starting, no fan sound?

sounds like ur tstat has gone out

Posted on Feb 26, 2010

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I have a few issues with an old probably dinosaur Coleman Presidential III 7995a-856 Heating unit. I've had 3 different repairmen look at it and they're clueless. The main pilot will light and stay lit...


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I have the exact same model with the exact same problem. Did you ever figure out what the problem was? I just picked up a new gas valve, but maybe i should check the flame sensor first. In my systems case the electronic ignition fires, which lights the pilot, but it keeps firing even though the pilot light is lit. So I think it could be the flame sensor, how do I remedy that or check it out. I would like to check this out first before dropping in the gas valve, cause they arent cheap and I can still return it before its installed.

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1 Answer

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The steps involved can vary slightly depending on your furnace model and pilot valve type, so if possible try and find the instructions inside the furnace door cover or in the instruction manual. This is for a gas fired furnace, but applies to any gas-fueled appliance including water heater. Two of the most common types of pilot valve body assemblies either have a red reset button and a gas valve or no reset button and a valve knob that can be depressed. But whichever type you've got, if you have an older model furnace with a standing pilot (flame is lit all the time) then this is the basic procedure.
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  • If you have a pilot with a red Reset button, turn the gas valve from "Off," to "Pilot."
  • If you have a pilot with no red button, turn the knob from "Off" to "Pilot."
  • Place the lit match or ignited lighter tip at the pilot and depress and hold the button or depress the knob as appropriate. Depress the button or knob for about 30 seconds. This maintains gas flow to the pilot until the thermocouple gets hot enough to open the main gas valve.
  • Once the pilot stays lit, slowly release the button or knob and turn the gas **** or knob from the "Pilot" position to the "On" position. This will ignite the burners and keep the flow of gas supplied as required for the burners as called for by the thermostat.
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    This is caused by dirt in the pilot tube. Take a needle or small nail and gently clean the tube. Flickering or Wavering Flame
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If the pilot won't stay lit, the thermocouple may be loose or faulty, the pilot orifice may be clogged, or the pilot light's flame may be set too low and needs to be adjusted. You can clear a clogged orifice with a piece of thin wire, such as a bread tie with the paper stripped off of it. Be sure to turn off the gas to the furnace first! Also shut off the switch or circuit breaker that controls power to the furnace. Just poke the thin wire into the tiny orifice where the pilot flame normally burns to knock off any ash or debris. Some pilots have a flame adjustment screw for adjusting the flame. To adjust this, refer to your owner's manual. Normally, this is simply a matter of turning the flame adjustment screw to achieve a full, steady 1 1/2-inch to 2-inch flame that doesn't have any yellow in it.

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