Well, I wonder how Raypak would fare building cars instead of furnaces. Maintenance required after a couple dozen trips to the shops?
Furnace failed to light, very lightly used. Pulled and cleaned the pilot / thermocouple again, fired up no problem. see my post from summer 2012.
Raypack 407A - Doesn't fire
Same problem....the small brass pilot insert that has the tiniest of holes was blocked. Note that this insert will come apart from the main assembly so you can give it a thorough cleaning in solvent. Do users of other makes of furnaces have this problem....or even users of Raypak furnaces. Maybe there is some contamination in my gas line? The blockage seemed to be something soft like warm chewing gum substance, but it's difficult to say as the hole is so small that one strand of light guage copper wire will go through, but two strands will not.
Anyway, she fired up no problem after the solvent clean of the 'spark plug', pilot assy and the small brass pilot assy insert.