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.
Can I Replace My Own Furnace Circuit Board?
First, be sure the board is bad. This often requires an HVAC tech to look at the furnace since many variables exist.
The control board should have a LED that flashes error codes. The codes often are listed on the panel door or somewhere in the unit.
If you have already gotten this diagnosis from an HVAC company, more than likely, this is the problem.
Buying the correct board online is the next step.
I personally usually use Amazon, but this is simply a personal choice as they have a large selection; eBay also has a good selection.
If you order a new control board, be sure to match the part number from the old board or the name and model of the furnace.
Example Furnace Control Board On Amazon.
ICM – ICM2805A – Furnace Control Board, 120/240 Input Voltage, for Use with Commercial HVAC Equipment, Residential
Every furnace will be slightly different, and the manufacturer’s directions should always be followed.
Steps To Replacing Furnace Control Board
- Unplug the furnace.
- Take a picture with your phone of the wiring and possibly a video. Simply be sure you have a reference to fall back to for what wires went were.
- Before handling the new board, ground your hand on a metal surface since static electricity can damage control boards.
- Remove the screws holding it in place. Try to leave the wires attached if possible; if this is not possible, transfer the wires one at a time to the new board.
- Insert the new board and screw it into place.
- Attach the wires to their correct location.
- Verify the wiring is correct from the picture that was taken.
- Plug the furnace back in and test it.
What Causes a Furnace Circuit Board Failure?
Circuit boards usually fail because of bad components or a surge in electrical.
Components such as resistors and capacitors can go bad, often caused by low-cost electrical parts.
An electrical surge such as an electrical store can also damage a circuit board and is a common cause of failure.
The cost for an HVAC tech to replace a furnace control board can be high but is necessary if you do not feel comfortable doing it yourself.
It does not take a lot of skill to replace a furnace control board, but if you do, be sure to watch a few videos like those listed below.
Also, be sure to get the correct replacement board using the part number.
Have yo had a replacement cost quote on a furnace motherboard control board? let us know in the comments below.