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I have a Coleman Patio heater. The flames are very yellow & I don't believe it is sending as warm a flame as it should. Would like to know how to adjust air intake or similar to alter this. I am a plumber gasfitter by trade and do have an understanding of how it works.

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The primary air adjustment is located at the burner inlet. To little air and you have yellow flame. To much primary air and you get flame lift off from the burner. The adjustment may be locked in position by a screw. To change the adjustment you must loosen the locking screw.

Posted on Sep 14, 2008

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My Coleman Evcon furnace Model EB 12B will start out blowing warm air and then before it reaches the temp set on thermostat starts blowing cold air. We had the thermostat changed over the summer and the...

look at the furnace and turn it on to see if the flames come on. Watch and see if they stay on for a period of time. If they come on then go out you may have a dirty flame sensor, if it goes out and then relights it may be a high limit switch getting weak. hope this helps.

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Hi, I don't know if you are still having a problem, but it sound like the flame sensor on the unit is dirty and need to be cleaned. If it has a automatic pilot, it will have a flame sensor. Its made of porcelin with a metal rod coming out the end, laying next to the pilot flame. Just 1 screw holds it in place. Remove it and clean the tip with steel wool or a piece of sanding cloth. If you don't have this set up, I would need more info on the unit, model and serial number. You may also have a faulty thermostat, but I do believe it is a flame sensor.

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Our Rinnai Symmetry heater's flame will not go higher than 4 we have left it on for more than 3 hrs and nothing changes. It is only new with twice being lit, the smell is still there too.

If you are using the Thermostat Mode, the flame height automatically sets itself to the operate flame height and fan speed to maintain that temperature setting. However, when the pilot is lit each time, after having been turned OFF, the flame height automatically goes to the highest setting, then after a few moments adjust to what the microprocessor determines is the proper flame height, based on the thermostat setting. If the room is very cold, the flame height will remain on High until the room starts to warm up to the preset temperature. Gradually, the flame will lower, as the room reaches the set temperature, as will the blower speed.

As far as the odor is concerned. The unit may not have been continually burned on a high flame setting long enough (at least 1 hour) for all of the oils to burn Off and the unit cures. This should be done a fairly mild day, when a window can be opened to allow the odor to go out the window. If the odor continues, it may may be due to what Rinnia calls an "Abnormal Flame Pattern". Which can be caused by a misplaced log on the burner, poor gas pressure, a clogged burner or an obstructed exhaust vent. This requires a service call from your local Rinnai dealer to solve.

In case you have misplace your Owner's Manual, I have included a link to it that you can download & print for future reference.

I hope this helped you and thanks for choosing FixYa. Cheers...

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There is a coulpe of reasons that the pilot would go out.
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2. Thermocouple is no in the pilot flame. Look and make sure it is directly in flame.
3. Pilot dirty. Flame has to be blue not yellow.
4. At the gas valve the thermocouple comes to it. use a wrench, usally 5/16ths, or 3/8s in. and make sure thermocouple is tight going into gas valve.
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Dennis easy fix what is your out going gas you will need a manometer to verify it accurately or adjust your gas valve til your blue flames are gone. Let me know what you find!

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1 Answer


sounds like a bad flame sensor try cleaning or replace if necessary it looks like a small metal tube on the side of the burner with 1 wire going to it .

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1 Answer

I have a vent-free Glo warm propane stove (as in fireplace type).Pilot is yellow and stays on enough to get fire going, but then whole thing shuts off. Does it need new part/cleaning?

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