I removed the back from the fireplace itself to see if I could find what was quite noisy. It turned out to be the small round motor with the flame rod connected to it. As soon as I unscrewed the motor from the frame the noise stopped. I put a small rubber washer between the mounting plate & the motor attachment frame where you screw the screws back in.& then put my screws back on. I had to get 2 longer screws for this because the original screws were now too short with the rubber washers. No more noise now. By the way, you can get the small rubber washers from any auto parts store. Easy fix in about 15 minutes.