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You may want to check the placement of the sparker electrode.
Since you have been working in and around the insides of the unit(heater).
The spark has to travel thru the "air/fuel" mixture at a point where the mixture is in the correct ratio. If that little tiny wire electrode wire was bumped, and moved 1/16 of an inch, it won't ignite the fuel/air, cause there might not be any fuel/air where the spark is.
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