Heat-N-Glo SL-550TV DSI Fireplace Ignition Problem

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.

If the pilot continues to spark it is definitely a rectification issue. Take some emery cloth or a dollar bill and try to clean off the rectifier as best as you can. If that doesn't work, you would need to replace the ignitor. Also, many times the manufacturer recommends that whenever you replace the ignitor, you replace the control module as well.