Actually the flame should have the color close to the flame below.
Any orange indicates a poor burn. This can cause several problems, the most dangerous is increased carbon monoxide. Another problem it will cause is the formation of soot which will have to be removed. The orange flame can be caused by several things, improper gas pressure and most likely a dirty burner that needs to be cleaned. Since you have indicated you do not have any messed with a propane furnace, I would like to strongly suggest that you have the furnace serviced by you favorite HVAC service company.
Many homeowners do not realize, the complications of not having a professional inspect the heating system yearly, can cause. If a fire, or worse, is caused by the furnace and there are no records of the furnace being maintained, the insurance company can and will deny the claim for damages. I have worked on systems after they have caught fire and the homeowners got no help from their homeowners insurance for the damage. I have installed furnaces in new homes that the owners were building to replace a home that was destroyed by fire from not having the furnace serviced. I like every customer to have this information to consider before repairing the furnace themselves. It would be a shame if you had a problem due to wanting to save a few dollars needed to have the furnace professionally serviced. I am all for DIY repairs but at times it id best to call a pro and watch them to see what they do.
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