If your furnace needs a new control board, the average cost for an HVAC technician to install it is $400-$700. If you are a DIY type of person, furnace control boards can be bought online for $50-$250, depending on the furnace.. The price of a new furnace control board starts from $50 and may range up to $250 depending on your furnace model. The average cost for an HVAC technician to install and replace furnace control boards is $400-$600. Control Board Replacement, A Step By Step Guide.
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Check the control board diagnostic light. The next thing that you should check is the control board's diagnostic/indicator light. Usually, the diagnostic light will blink a certain number of times, depending on what is going on in the control board. For example, 3 flashes could mean that the furnace's inducer pressure switch is not triggering.. The furnace circuit, or control board is one of the furnace parts that regulates the power supply to all the furnace components. When the home's thermostat calls for heat, the furnace goes through a timed ignition sequence that is initiated when the circuit board sends 120 volts of alternating current to the furnace's draft inducer fan.
