control board

How Do I Know If My Furnace Control Board Is Bad?

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How Do I Know If My Furnace Control Board Is Bad? Warning lights. Typically, control boards have LED indicators that function as warning lights. … Temperature instability. … Interruptions in the event sequence. What does the furnace control board do? The control board runs a series of operations—starting the electronic ignition, opening the gas valve,

How Do I Know If My Furnace Circuit Board Is Bad?

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How Do I Know If My Furnace Circuit Board Is Bad? Common warnings signs that your furnace control board is bad include warning lights on your furnace’s diagnostic system (see step 1 below), temperature instability (significant fluctuations in temperature, especially when the thermostat is ok) and interruptions in the normal sequencing of your furnace. How