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Most shops have a board tester that can test this for you. What are the symptoms you are having?
Is this in a furnace or water heater?
How long does it run before shutting down?
How long has it been since you drained the water heater and flushed out the calcium deposits? If it runs for two minutes the board is fine.
Then drain it out and flush it good and refill it and see if that solves this. And you might want to have the LP pressure at the tank regulator checked to be sure that the LP pressure is not too low as that can cause this.