Machine stopped filling. Possibly related to well equipment sulfur filter media getting into water lines. No voltage to fill solenoids with fill LED blinking, nor when they are supposed to be active during diagnostic mode /and I noticed none of the other functions activate either. There is voltage IN to the main control board, but no voltage OUT, even to the motor./
Replaced the main control board, /purchased locally,/ but after an unusually bright flash at the outlet while plugging in the machine, the same problem is back. 
One of your techs wrote me that a spark when plugging in the machine is normal, but the sparks I get are unusually energetic/, more like a flash/.
This model does not seem to have an Inverter Board Status Indicator Light, unless it’s hidden by the splash shield on top of the motor.
What might cause the unusually strong spark when plugging in the machine and how do I check why /the main control board doesn’t put voltage OUT?/
There are no noticeable burnt areas on either the old or new main control board to help pinpoint the problem…HELP!!