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Intertherm propane furnace will not stay on

Gas will ignite as normal run for a minute or two then shut off gas and pilot light, then fan will come on. Have changed thermocouple, clean pilot assymbly, blew off heavy dust on fan switch sensors. Problem does not occure when I have access door open and watching flame only when the metal door is closed.

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  • Contributor
  • 40 Answers

Your machine is missing the oxygen check your ventilation,
1. try to turn it for 1 minute with leaving the door open.

Posted on Mar 24, 2014

Testimonial: "turn what? So long as door is open it works sometimes with door close it works can not find a place to allow more air in chamber."

  • Russell Sadowski
    Russell Sadowski Mar 25, 2014

    Gas valve has an open ended copper tubing a little smaller than the thermocouple and runs from gas valve to pilot light assymbly what is this for?

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Posted on Jan 02, 2017

  • 49 Answers

SOURCE: intertherm furnace explosive burner ignition

You absolutely must stay with Therin's recommendation. You do have a block or a cracked heat exchanger and this is nothing to toy with. Carbon Monoxide is very serious and dangerouos. All of your new furnaces should be power ventilated and you need to retire that one.

Posted on Nov 20, 2007

  • 2 Answers

SOURCE: Rheem gas furnace pilot lights, but no burners or fan

If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

Posted on Jan 06, 2009

meBNme
  • 334 Answers

SOURCE: weak flame in intertherm furnace

Ok, so we can rule out the ignitor. (standing pilot systems can develop problems that will cause such symptoms.)

Check the gas pressure, make sure you are getting 11 to 14 PSI.

You need that after the regulator all the way to the manifold.

Also check for cracks in the heat exchanger, causing the wind from the blower to distort the flame pattern enough to cause improper contact with the flame sensor.

Make sure the burners and flame channels are clean of rust, and dibri build up, allowing the flame to properly contact the sensors.

Posted on Jan 19, 2009

jumptrout51
  • 3361 Answers

SOURCE: pilot light wont stay lit.want to clean the orifice

You shut off the gas.
Shut off the power.
Remove the gas valve and burner assembly.
After cleaning and reassembly you must purge the system and use a gas leak detecting soap to verify no leaks before turning on the power.

Posted on Apr 15, 2009

  • 1015 Answers

SOURCE: gas furnace, main burner ignites the other 2 don't. then shutdn.

Between the burners is a small rail in the pressed steel where the flame runs across to light the other burners and it sounds like there is dirt or debris in the step over rails causing the problem. You will need to use some compressed air on those rails to clear them out. Once the rails are clear the other two burners should ignite right away.

Posted on Dec 21, 2009

Testimonial: "I did not expect such a quick response. These are hard times for us and we really appreciate your help. Thankyou for sharing your expertise."

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If the burners do not fully ignite, the sensor will shut the furnace down. The lack of sufficient burner flame is a gas valve or gas pressure problem within the valve.
Replacing the gas valve with the original one may get you going. I surely suggest a professional service company for safety reasons and a thorough inspection. A 20 year old furnace is past it's normal life span.

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