LG LDG4315ST - Lower Oven No heat with error code F19. I removed the lower oven's outer burner cover and began taking off the inner cover. There are (5) screws that secure the inner cover, with one on the bottom middle. You have to lift the assembly to expose the screw, but I wasn't able to unscrew it due to clearance issues. A little side to side rocking and it came out, which exposes the burner and igniter. I depressed the door safety, set the lower oven temperature and hit start, but the original igniter didn't glow and I verified it was the problem.
I unplugged the oven and attempted to pull down the igniter's wiring, but was unable to. The igniter's connector was stuck and there didn't seem to be any way to reach it. I removed the larger lower back cover, which exposed the igniter's connector. It was secured by a factory wire tie, which verified my concerns of pulling on it. I unclipped the connector and tried to push the connector past the nozzle/burner assembly, but it was too large to fit through. I removed the nozzle screw that secures the burner to it and returned to the front. I removed the three burner screws and pulled the burner towards me and removed it with the bad igniter.
I installed the new igniter and pushed the wiring back through first and lightly secured the burner with 1 screw on the left. I went to the backside and secured the burner to the gas nozzle to test the system. I plugged the oven in, depressed the safety, set the temp, and hit start and the new igniter glowed immediately. I stopped the oven, unplugged it, and began putting everything back together. Overall, not a terrible job. A low-torque electrical screwdriver would make it go faster for the back cover screws.