American Standard freedom 90 single stage - gas
check all your grounds in furnace. check from hot to ground and common to ground. If you have more than 10V from common to ground then you have a parts that is shorting to ground internally. ohm out the igniter ... sounds like a nitride igniter and should be between 10 -18 ohms. if everything checks ok... then probably a control board. lets take 1 step at a time though. let us know what you find.
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