Are you paying for these circuit boards?
Do your other propane appliance work? Have you used the furnace?
A good test of the "circuit board theory" is to unplug the white electric connector plugged into the board, leave it off a few minutes, reconnect and retest the heater (take a picture of the connector before you unplug it).
If the heater works for a week then the dealers "circuit board theory" has failed.
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