Good morning Lucy, I hope you are feeling well today.
I got in touch with the Comfort Glow Technician. I told him about our problem, the following is what he told me.
He said there hasn't been any more calls than normal about this problem in technical dept. on the Shenandoah Comfort Glow, Model LBFL24.
He said he gets some inquires on almost all models of fireplaces pretaining to this problem. The inquiries are about a high pitched humm or vibration sounding noise in the fireplaces, as if it were coming from the burner area.
He said the problem can be the following.
1-In the manufacturing process while the orifices are being drilled the angel of the orifice was drilled wrong. He said that if the orifice is to be drilled at 33 degrees and something happens and it gets drilled at 34 degrees. Being off that one degree will cause the problem we have.
2-During the process of drilling the orifice, a metal burr, the shavings from the drilling process can either be in the orifice or the burner body. Causing the loud humm.
3-The drilled hole in the orifice is not a smooth bore as it should be. Caused by a dull drill bit, sanded incorrectly, Etc;.
His advice is to take the orifice out and take it to you gas company. Buy another orifice of the same size & specifications.
Replace the orifice, this usually solves the problem.
If the humm is still there you will need to have the burner body inspected for any metal shavings, cracks, defects, Etc;. He said almost always it ends up being the orifice being the culprit.
Lucy, when I had the burner body disconnected I would take a piece of wood and tap the burner body all over. This will loosen any shavings that could be in the burner body. Just tap it all the way around and shake anything that's loose out of the orifice hole.
Lucy, the orifice is not hard to remove. Just kill any and all the power first! Make sure and cut the gas off at the tank and at the fireplace, preferably. Follow the main gas line down to the burner. You will need to loosen and take the main gas line off of the burner body. Now, you are looking at the orifice that screws into the fireplace burner body. You will need to remove the orifice in a (counter clockwise rotation) and take it to the gas company for a replacement.
Lucy, I would be very curious to know how this turns out. This gentleman I talked with sounded very knowledgeable concerning this particular problem and the solution. So I would think that you have been given the correct information and the solution to your problem.
It has been very nice and enjoyable talking to you Lucy. Please, let me know how this turns out.
Thank You For Choosing justanswer, Good Luck,
P.S., I will be waiting to hear from you, I hope.