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Furnace Control Board

Furnace Control Board

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    Lennox Circuit Board Part #39M84

    Lennox

    MSRP: $523.69
    Now: $404.67
    Lennox® Fan Control Board # 39M84 is the current part number for Honeywell® Control Board # ST9103A1069   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - Everytime No...
    MSRP: $523.69
    Now: $404.67
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    Lennox Defrost Board Part #17M14

    Lennox

    MSRP: $158.48
    Now: $122.46
    Lennox® Defrost Control Circuit Board  FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $158.48
    Now: $122.46
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    Amana-Goodman B1809913S HSI Board w/9-Pin Connector

    Amana-Goodman

    MSRP: $265.48
    Now: $205.15
    Amana-Goodman B1809913S HSI Board w/9-Pin Connector FurnacePartSource.com Commitment Always Brand-New Genuine Parts In stock parts ship Same Business Day when ordered by 5PM ET No Minimum Order Requirements unless noted above
    MSRP: $265.48
    Now: $205.15
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    Goodman Circuit Board Part #PCBBF112S

    Amana-Goodman

    MSRP: $192.44
    Now: $148.70
    Goodman PCBBF112S CIRCUIT BOARD   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements
    MSRP: $192.44
    Now: $148.70
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    Carrier Products Circuit Board Part# CESO110074-01

    Carrier

    MSRP: $576.39
    Now: $445.40
    Carrier® Products Circuit Board Part# CESO110074-01, aka CES0110074-01; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order...
    MSRP: $576.39
    Now: $445.40
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    Carrier Products Circuit Board Part# CESO110063-02

    Carrier

    MSRP: $237.88
    Now: $183.82
    Carrier® Products Circuit Board Part# CESO110063-02, aka CES0110063-02; Timer/Defrost Circuit Bard; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts -...
    MSRP: $237.88
    Now: $183.82
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    Carrier Defrost Control Circuit Board Part# CESO110053-00

    Carrier

    MSRP: $432.81
    Now: $334.45
    Carrier Defrost Control Circuit Board Part# CESO110053-00    FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements      
    MSRP: $432.81
    Now: $334.45
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    Carrier Products Circuit Board Part# 325879-751

    Carrier

    MSRP: $1,009.85
    Now: $780.34
    Carrier® Products Circuit Board Part# 325879-751; Direct Cross for Obsolete Carrier # HK42FZ010; Circuit Board Plug Kit; Comes with Installation Manual; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships...
    MSRP: $1,009.85
    Now: $780.34
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    Carrier Products Circuit Board Replacement Kit Part# 322848-751

    Carrier

    MSRP: $242.32
    Now: $187.25
    Carrier® Circuit Board Replacement Kit; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum Order Requirements
    MSRP: $242.32
    Now: $187.25
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    Carrier Products Inducer Board Part# 313680-751

    Carrier

    MSRP: $295.35
    Now: $228.22
    Carrier® Inducer Board; Direct Cross of Obsolete Carrier/Bryant/Payne # HH84AA007; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - EverytimeNo Minimum...
    MSRP: $295.35
    Now: $228.22
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    Armstrong Furnace Blower Control Part# R40403-003

    Armstrong Furnace

    MSRP: $212.72
    Now: $164.37
    Armstrong® part# R40403-003; Blower Control Fan Timer Board; Comes with Installation Manual; Backed by a One Year Warranty.
    MSRP: $212.72
    Now: $164.37
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    Rheem HSI Integrated Furnace Control, Part #695-200

    Robertshaw

    MSRP: $215.84
    Now: $166.78
    Circuit Board. This part is manufactured by Robertshaw® for Rheem; ; Comes with User Guide; Backed by a One Year Warranty.
    MSRP: $215.84
    Now: $166.78
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    Carrier Circuit Board, Part #HH84AA021

    Carrier

    MSRP: $225.31
    Now: $174.10
    Carrier/Bryant/Payne® Circuit Board, Part #HH84AA021; Backed by a One Year Warranty.   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order...
    MSRP: $225.31
    Now: $174.10
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    York Controls Fan Timer Circuit Board, Part #S1-031-02959-000

    York

    MSRP: $563.01
    Now: $435.06
    York Controls® Blower Control Board # S1-031-02959-000 replaces Honeywell® Fan Timer Board # ST9120C2002 and also York Controls® # S1-331-01237-000   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business...
    MSRP: $563.01
    Now: $435.06
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    Lennox Fan Timer Board - Part# X8609

    Lennox

    MSRP: $442.83
    Now: $342.18
    Lennox® # X8609 replaces Obsolete Lennox® # 28M99, 87H88, Armstrong®# R45692-001, Honeywell # ST9160B1027 and ST9160B1068, and Ducane# 20430801;   FurnacePartSource.com Commitment Item Typically Ships within the Same Business Day...
    MSRP: $442.83
    Now: $342.18
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    Nordyne Circuit Board, Part #903429

    Nordyne

    MSRP: $202.97
    Now: $156.84
    Nordyne® Control Board # 903429; Control Board for M series units   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements
    MSRP: $202.97
    Now: $156.84
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    Nordyne Circuit Board, Part #903106

    Nordyne

    MSRP: $397.90
    Now: $307.47
    Nordyne® Circuit Board # 903106   FurnacePartSource.com Commitment Item Typically Ships Within the Same Business Day Brand-New Genuine Parts - Everytime No Minimum Order Requirements
    MSRP: $397.90
    Now: $307.47
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Shop replacement furnace control boards, HVAC circuit boards, and control board assemblies for heating and cooling systems. Some shoppers refer to these parts as furnace motherboards or HVAC motherboards. Find boards from brands such as York, Carrier, Trane, Goodman, Amana-Goodman, Nordyne, Mitsubishi Electric, ClimateMaster, Lochinvar, and more. Match your OEM part number, equipment model number, wiring connections, and board function before ordering.

Shop Furnace Control Boards and HVAC Circuit Boards

Furnace control boards and HVAC circuit boards manage many of the electrical functions inside heating and cooling equipment. Depending on the system, a control board may help coordinate ignition, blower operation, thermostat signals, safety switches, diagnostic lights, fan timing, or system communication.

Furnace Part Source carries replacement control boards for furnaces, air handlers, air conditioners, heat pumps, and other HVAC equipment. Because these boards are model-specific, use the OEM part number, board number, equipment model number, and wiring connections to help confirm the correct replacement before ordering.

What Does a Furnace Control Board Do?

A furnace control board is the electronic control center for many furnace and HVAC system operations. It receives signals from the thermostat and helps coordinate the ignition sequence, blower motor timing, safety switches, limit controls, diagnostic lights, and other system functions.

When the control board is working properly, the furnace can respond to heat calls, start the ignition process, manage fan operation, and communicate with connected components. If the board fails or loses communication with other parts, the system may stop responding, short cycle, fail to ignite, or show error codes through blinking diagnostic lights.

When to Replace a Furnace Control Board

A furnace control board may need to be replaced when it can no longer send or receive signals correctly between the thermostat, ignition system, blower motor, safety switches, and other connected components. Common warning signs include a furnace that will not respond, intermittent startup problems, short cycling, ignition failure, blower issues, or diagnostic lights showing repeated fault codes.

These symptoms do not always mean the control board is the only problem. Thermostats, transformers, flame sensors, ignitors, pressure switches, relays, wiring, and safety switches can cause similar issues. Before ordering a replacement furnace circuit board, confirm the diagnosis and match the OEM part number, equipment model number, wiring connections, and board configuration.

The furnace does not respond to thermostat calls.

The ignition sequence starts and then shuts down.

The blower motor will not start, stop, or run at the correct time.

The system short cycles or stops before completing a heating cycle.

The board has visible burn marks, damaged terminals, or failed relays.

The furnace displays repeated diagnostic light or error code patterns.

Fuses continue to fail after related wiring and low-voltage components are checked.

How Much Does a Furnace Control Board Cost?

The cost of a furnace control board depends on the brand, part number, board type, system configuration, and current availability. Some replacement boards are made for specific furnace models, while others may be used for broader HVAC control applications. Always compare the listed product price with the exact board number, OEM part number, and equipment model before ordering.

If you are researching furnace control board replacement cost, remember that the part price and labor cost are separate. Furnace Part Source sells the replacement board itself, while installation labor may vary based on the technician, location, diagnosis, system access, and whether other parts also need service.

For the most accurate part cost, search by the OEM part number, board number, furnace model number, or manufacturer name. This helps narrow the product list to boards that match your equipment instead of comparing unrelated control boards by price alone.

How to Choose the Right Replacement Control Board

The best way to choose a replacement furnace control board is to match the original board as closely as possible. Control boards are often built for specific furnace models, HVAC systems, ignition types, blower functions, wiring harnesses, and safety circuits. A board that looks similar may not be compatible with your equipment.

Before ordering, check the OEM part number, board number, furnace model number, serial number, and any cross-reference information from the service manual or manufacturer documentation. If the original control board has been replaced before, compare both the old board and the equipment label to confirm the correct part.

Match the OEM Part Number

Start with the part number printed on the existing board, service panel, parts diagram, or equipment documentation. The OEM part number is usually the best way to narrow your search and avoid ordering a board with the wrong connections or control functions.

Check Furnace or HVAC Model Compatibility

Use the furnace, air handler, heat pump, or HVAC model number to confirm compatibility. Some control boards are designed for a narrow model range, while others may replace multiple older board numbers through an approved cross-reference.

Compare Ignition, Blower, and Safety Control Functions

Review the board’s role in the system before replacing it. The correct board must support the equipment’s ignition sequence, blower timing, thermostat communication, safety switch inputs, diagnostic lights, and wiring layout. If any of these functions differ, the replacement board may not operate correctly.

Control Board vs. Circuit Board vs. Motherboard

In HVAC parts, “furnace control board” is the most common term for the electronic board that manages furnace and system functions. Some shoppers also call this part a furnace circuit board, HVAC circuit board, furnace motherboard, HVAC motherboard, computer board, or PCB board.

These terms may point to the same general part category, but the correct replacement depends on the exact board number, OEM part number, equipment model, wiring layout, and control functions. Always use the manufacturer part number or approved cross-reference when choosing a replacement board instead of relying on the name alone.

Brands and Replacement Boards Available

Furnace Part Source carries replacement furnace control boards, HVAC circuit boards, and control board assemblies from many HVAC manufacturers. Available products may include boards for brands such as York, Carrier, Trane, Goodman, Amana-Goodman, Nordyne, Mitsubishi Electric, ClimateMaster, Lochinvar, Schneider Electric, International Comfort Products, and more.

Availability can vary by part number, manufacturer, and stock status. If you are replacing a failed board, search by the exact OEM part number, board number, furnace model number, or approved cross-reference. Brand names alone are not enough to confirm compatibility because many manufacturers use different boards across model families and system configurations.

Related HVAC Parts to Check

Before replacing a furnace control board, it may help to check related HVAC parts that can create similar symptoms. A furnace that will not start, short cycles, fails to ignite, or does not respond to the thermostat may have a control board issue, but it may also involve a thermostat, transformer, flame sensor, ignitor, pressure switch, relay, wiring connection, or blower component.

If the control board has visible damage, failed terminals, burned areas, or repeated fault codes after other components have been checked, replacement may be the right next step. If the diagnosis is unclear, compare the symptoms with the service manual or have the system inspected before ordering a replacement board.

Check the thermostat if the system does not respond to heat or cooling calls.

Check the transformer if the board is not receiving proper low-voltage power.

Check the flame sensor and ignitor if the furnace starts but does not complete the ignition cycle.

Check pressure switches and safety switches if the system shuts down during startup.

Check relays, wiring, and blower components if fan operation is inconsistent.

Furnace Control Board FAQs

What is a furnace control board?

A furnace control board is the electronic board that helps manage key furnace and HVAC system functions. It may control the ignition sequence, blower motor timing, thermostat communication, safety switch signals, diagnostic lights, and other connected components.

How do I know if my furnace control board is bad?

Possible signs of a bad furnace control board include no response from the furnace, intermittent startup issues, ignition failure, blower motor problems, repeated short cycling, burned areas on the board, or flashing diagnostic codes. These symptoms can also be caused by thermostats, transformers, ignitors, flame sensors, switches, wiring, or other parts, so confirm the diagnosis before ordering a replacement board.

How much does a furnace control board cost?

The cost of a furnace control board depends on the brand, part number, board type, system configuration, and availability. Product price is separate from installation labor. If you are comparing furnace control board replacement cost, make sure you are comparing boards that match your exact OEM part number, model number, and control functions.

Is a furnace control board the same as a furnace motherboard?

Many shoppers use the term furnace motherboard when searching for a furnace control board or furnace circuit board. In HVAC parts, control board or circuit board is usually the more common product term. Always match the exact part number, board number, wiring layout, and equipment model before ordering.

Are furnace control boards interchangeable?

Furnace control boards are usually not interchangeable unless the replacement is specifically approved as a compatible part or cross-reference. Boards can differ by wiring connections, ignition type, blower control, safety circuit inputs, diagnostic functions, and system configuration.

Can I replace a furnace control board myself?

Replacing a furnace control board requires matching the correct part, disconnecting power, handling wiring correctly, and following the equipment manufacturer’s service instructions. If you are not comfortable working with HVAC electrical components or confirming compatibility, use a qualified HVAC technician.

What should I check before ordering a replacement furnace control board?

Check the OEM part number, board number, furnace model number, serial number, wiring harness, ignition type, and any approved cross-reference information. If the board has been replaced before, compare the existing board with the equipment label and service documentation.

Do HVAC control boards work for both heating and cooling?

Some HVAC control boards manage system-level functions, while others are designed for a specific furnace, air handler, air conditioner, heat pump, or inverter application. Do not assume a board works for both heating and cooling unless the part listing or manufacturer documentation confirms compatibility.

Where is the furnace control board located?

The furnace control board is usually located inside the furnace or air handler control compartment. Exact location depends on the equipment model. Check the service panel, wiring diagram, or manufacturer documentation before removing covers or handling electrical parts.

Can a thermostat problem look like a bad control board?

Yes. A thermostat problem, low-voltage wiring issue, transformer failure, safety switch fault, or sensor problem can create symptoms that look like control board failure. Check related parts and confirm the fault before replacing the board.

Need Help Finding the Right HVAC Control Board?

Before ordering a replacement furnace control board, gather the OEM part number, board number, equipment model number, serial number, brand name, and any cross-reference information from the existing board or service documentation. These details can help narrow the product list and reduce the risk of ordering a board that does not match your system.

If your original board is damaged, discontinued, or difficult to identify, Furnace Part Source can help you search for a compatible replacement. Contact us with your equipment details, part number, and photos of the existing board if available, especially if you are comparing furnace control boards, HVAC circuit boards, furnace motherboards, or control board assemblies.