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Re: burner flame adjustment
There are two considerations for burner height. 1) the gas adjustment screw on the knob and 2) the gas-air mixture to the burner. establish a flame and adjust the screw for a standing flame at the burner. adjust the gas-air ratio orifice so that the flame has no yellow tips.
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Most burners have an adjustment under the knob. Pull off the knob and use a slender flathead screwdriver. Turn burner down to low, insert screwdriver into knob shaft and rotate internal screw until flame is at "simmer" height. Can adjust each burner separately this way.
There are two things that control flame height gas volume and air volume. Some fireplaces have a flame control knob on the gas valvd to adjust flame height. Air volume is controlled by an air shutter usually located where the main gas orifice enters the burner. There is usually a small cover that will need to be removed to access the shutter. Closing the shutter will cause the flames to become taller and more yellow colored. Closing the shutter too far will cause sooting problems so great care should be taken in adjusting this shutter.As a rule, L.P. gas fireplaces do not have as high of a flame as natural gas unit do.
Hope this helps
There is an air port near the adjustment knob. Open for a more blue flame and close for a yellow flame. If these haven't been moved before, you probably have a clogged jet at the burner. Just clean it out with a pin.
Generally, whether it's a Vent-free or Vented fireplace, lower than normal flame height is caused by 3 things: Low Gas pressure; The air shutter control valve is clogged or needs adjusting; The burners need cleaning.
I haven't seen a unit in the past 10 years, that has a flame height adjustment, other the flame height control knob, that's part of the control assembly. Have you checked that, to see what height it's turned to low?
Perhaps, if I knew who the manufacturer was and the model number, I could be of more help to you.