How do you find a damaged control board and Replace it in the Furnace?

What is a furnace control board?

Control boards are specially designed for controlling furnaces and heating units in HVAC systems. It is the brain of the furnace because the control board controls all parts of the furnace. In a direct wire-for-wire replacement, they may Replace OEM control boards. Use heat units and components that are compatible.

What are the common reasons for failing the control board?

• The circuit board is near the expiry date.

• Failed blower motor.

• Fuse wiring is not compatible.

• Contamination with chemicals.

• Circuit-board failed connections.

• Filters are clogged.

• Relays and controls are stuck.

• The buildup of dirt, dust, small particles, and debris in the unit.

• Heat, condensation, and wetness in excess.

• Because of a faulty starting capacitor.

• There are spikes and troughs in power.

• Uniform electricity.

• The board or its connections have corroded.

What are the symptoms of a bad control board?

• Warning lights

• The unstable temperature in the system

• High electricity bills

• Suddenly the system is On/ Off

How long do furnace control boards run?

10 to 15 years is the lifetime for the control board. Correct maintenance increases the life of the control board. Do not increase the load and electric supply on the control board, and high voltage or overload may damage the control board fastly.

How to know if the control board is damaged or not?
Open Access panels:

The control panel and other internal furnace parts are usually housed in one or two access panels. These could be secured in place by a clasp or with screws. Before continuing, use the screwdriver to unscrew access panels.

Check the diagnostics:
Most furnaces have a plastic or glass port with LED lights behind the access panel. By blinking in specific patterns, those LED lights assist you in diagnosing difficulties in your furnace. Compare the light to the trouble codes listed in your furnace's manual. From the code, you can understand your furnace problem.

Check the Indicator Light on the Control Board:
The control board is usually found next to the blower. It should stand out immediately because of the many wires that go through it. First, make sure the control board is receiving electricity. Check your control board has an indicator light. Indicator light simplifies finding issues on a control board.  

Find the location of the Transformer's Common Wire:
This stage may appear to be difficult, but we'll break that down for you. The transformer is a small rectangle-shaped box that is connected to the furnace. It contains two high voltage wires and two low power voltage wires attached to it. The common wire is one of those high voltage wires, commonly the black wire. The transformer will be labeled with "COM".

Test the Power:
Next, find the voltage level by looking for the wire that connects the doorway button. On the control board, it's commonly designated "LINE." This is the wire that connects your furnace to 120 volts. Connect the meters to the metal line voltage connector and the common wire from the previous step. Your voltage meters should read 120 volts.

Check the Transformer's Power:
Connect the meters leading to each transformer's high voltage wires. Your meters should read 120 volts, showing that 120 volts are being supplied to the transformer. If you notice 120 volts entering your transformer but no 24 volts flowing out, your transformer is probably the source of the problem.

Check your Molex Plug's Power:
Follow the two low-voltage wires, where they'll be connected to a Molex socket. Place your meter leads into the Molex plug sockets at which low voltage level wires run, and your meters should read 24 volts once more.

Check the Terminal Strip's Power:
The terminal strips in your furnace are generally at the control board's border. R, W, Y, G, and C terminal strips have five different colors of wires for different stripes. The "R" wire checks for low voltage coming from the terminal strip. Connect the "R" and "C" wires with your meter leads. You should see 24 volts once more.

How to replace the control board in a furnace?

• Before starting replacement work, switch off the power supply.

• Note all wire connections.

• Disconnect the wires from the old control board.

• Replace the old control board with a new one.

• Fix the screws and secure the control board with plastic clips.

• Reconnect wire 

• Turn on the power supply to the furnace.

• Verify your new control board and that the furnace is running correctly.

• If any problem is occurring, then inform an HVAC technician.

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PartsHnC has a wide range of control boards at an affordable price. Control boards are an essential part of every HVAC system. So, the quality of the control board matters for the overall HVAC system's work efficiency. Purchase the best suitable control board for your unit from the PartsHnC eCommerce platform. Contact us for more information at [email protected] or call (866) 963-0907.