I had diagnostic done on my Comfort Maker air unit. The circuit board is bad. It will cost me $400+ for a professional company to replace it. Can anyone assist with how to do it myself?

Let's a see, no make or model of the air conditioner. No circuit descriptions.

You are asking us to tell you how to R&R a circuit board, there may or may not be more than one, and giving us no information on the board.

Can you give me a model number so I can at least look on the web and see if I can find a product description? :)

I can't tell you how to replace the circuit board, but I can share with you from personal experience that something on that level will cost you a whole lot more to repair if you screw it up than the $400 the HVAC guy wants.

My hubby and I spent 4 years of our life restoring a home in a historic district. We learned the hard way to use professionals when unsure how to proceed.

Simple

First> obtain the correct circuit board for your equipment. Look to see if it has been modified from the original by comparing the boards side by side. Usually if there is a change a small wiring harness will be supplied and instructions will be in the new boards shipping box. Also check for dip switch settings if present and set to the manufactures instructions in the box OR set them the same as on the old board.

Second> mark and identify all wiring going to the old board by color and where they land(attach) to the board. You might want to use labels to identify each wire to be sure.

Third> remove all wiring from the old circuit board.

Forth> remove old circuit board from the equipment.

Fifth> install new circuit board in the same place as the old one you removed.

Sixth> replace the wiring that was removed from the old board to the new board. Paying attention to exactly where the wire goes and how it is connected.

Seventh> Look over all work performed to be sure no mistakes have been made.

At this time you should be ready to reactivate your system. Replace all equipment doors removed when servicing the unit and fire that baby over. If all direction have been followed it should work.

Life is good again!

You could take a nice closeup photo of the original,, then you will have a picture of how it should be,, when installed

Just remember if you blow the new board,, you will have to eat it,, they are hard to chew

Yet another warning... very often there is a reason the board failed... if you change the board and didn't find the reason... it'll be back.