We're using the Visible Defects LLC ultraviolet dye. Drop the blower out, spray the inside, stick your UV flashlight in the burner chambers and watch the dye leech in.
Originally Posted by I_bend_metal
I love that dye, we use it all the time. I've found cracks with it that my SeeSnake missed.
Good? Bad? I'm the guy with the gun.
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Any technical advice offered by me is for educational purposes only, all HVAC related repairs should only be attempted by qualified personnel.