LG5791XSWO BURNER NOT LIGHTING ALL THE TIME, INTERMITTENT

Sounds like the burner is cracked and it is lighting back to the injector

The circuit board that generates the spark is intermittent. Look at replacing it.

If its lighting with the panel and baffle removed, but now with them installed, but you get a heavy gas smell its likely the gas mixture is too rich (i.e. the covers are too tight, gas pressure pushes all air away from burner so only gas and very little air occupies the space above the burner and its too rich to light, oxygen starved.) Not an issue when the covers are removed, so it lights fine. Try adjusting the burne for less gas an more air, see what happens.

looks like a faulty pressure valve

qualified gas fitter needs to check over the gas part of the fridge

The burner is not level ,or you need to adjust the air flow on the end of the burner.

If it is not igniting and hold the flame and getting red, it could be that the burner is dirty and clogged or the thermocouple that keeps the burner lit has failed.Please keep in mind, when lighting an infrared burner, you must hold the burner control knob in for several minutes. At least until all the ceramic plaques are glowing brightly. if the igniter won't light it, try match lighting it, while you hold the burner control knob in.

Most gill manufacturers recommend lighting and burning the infrared rotisserie burner on a regular basis, whether you use it or not,. Doing this helps to keep the burner clean.

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

Try cleaning your thermocouple,and resetting it where was, which is located at the pilot flame. this should solve your problem.

Very common problem, I would replace the oven ignitor first as they get weak with time and cause intermittent burner lighting. Good Luck, Appliance Specialists

My parts list doesn't tell me if that is an auto relight unit or not. But since you say it happens on any burner I'll leave out stuck ignitor switch for now.
Check the house ground wire to the unit and check that the burner caps are installed properly. The auto units read a ground when they ignite so if the burner caps are on wrong or dirty they can cause this.

jim

Try new gas valve coil packs they are inexpensive, and easy to install and fix 90% of intermittent lighting complaints