I believe this is the furnace with a spark to light the pilot light. If so the best advice I can give is to replace the whole pilot assembly. There is a very old style flame sensor in there that is not serviceable. This has driven many a technician around the bend.
**NOTE: It is a real pain to get out, and back in. You need to take off the fire box cover and the panel underneath it to get it out. You also need to take the pilot tube off the gas valve. This may be something that you want to call a service tech for. It could be a little tricky and because you are dealing with gas, you want to make sure that it is put together correctly and safely.
Part is around $60.00, you need a 11mm open-end wrench, 6 screws (2 for front cover, 4 for bottom cover)....when you disconnect the pilot gas line there is an orfis piece that can fall out (the replacement assembly comes with one). Switch off the electric to the furnace. I remove the assembly, bracket and all, from the firebox (2 screws) and then take off the mounting bracket to remove the ignitor and transfer to the new assmbly. It's a 30 mintue job. Don't forget to push the fat red sparker wire back onto the ignitor.
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