I’ve been having a problem “lighting” my Heat-N-Glo SL-550TV DSI Fireplace. When I turn on the switch, I can hear the gas valve open and then the igniter generates a spark across the two electrode probes. The burner ignites and everything looks normal, except the igniter continues to spark. After about 3 seconds, the spark jumps from the left electrode probe (the one with the insulator) downward to the metal floor of the chamber. After about 5 more seconds the whole thing shuts down in lockout mode. I checked the venting, cleaned the openings in the burner and generally cleaned out all of the dust throughout. I did notice that a wafer thin layer of top the of the ceramic insulator has flaked off and that there is quite a bit of rotational movement of the electrode probe inside the insulator. I’m not sure if there is supposed to be some movement or adjustment. There is about 1 inch of movement, with little resistance to keep it in position. The manual indicate that it should be ¼” between the probes, and I tried lighting it in various positions all of which made no difference. There are no other electrical or sensors inside the fire box. Best I can determine, all of the wiring connections seem to be secure, including the ground. I am inclined to buy a new igniter, but it is a pricey part! Anyone familiar with Heat ’n’ Glo fireplace units and seen this issue before? Pictures: 1. Igniter probe overall note top layer of insulator to the right of igniter 2. Ignititer spark at 2 seconds. 3. Burners lit, Igniter spark jumps to floor at 3 seconds.