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First you need to test for 24 vac at 24v & 24v GND on the ignition control. If you read ~24 v there then you can try connecting a cable to the spark terminal and see if it arcs to the boiler chassis. If it doesn't and you have a good ground from the ignition control to the chassis then the control is suspect. If there is any doubt we would replace the pilot burner assembly before replacing the ignition control.