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Terry has the unit been tilted or layed down since it last worked?
Are you able to unplug the unit and do some troubleshooting?
This will require opening the unit up
OK what I want you to check is to see if the level switch is in place making contact with board. This switch is installed so heater will not work if it gets turned over. See images below for where it is located.
Just make sure it is hanging straight up and down so those 3 little contacts make on board
What is model on yours?
Sorry was hunting the video for you
I hate to do this, but have to take a phone call. Locate the level switch and make sure contacts are all three touching.