Do I simply just kill the power and replace the control board? Is there anything else that I need to do?

  • If, by chance, you're using an ICM 281 board, it comes with very nice instructions and a troubleshooting code sheet. – isherwood Oct 28 '16 at 15:14

It was pretty easy.

First and foremost I killed the power to the unit. I turned off the power to the unit from the breaker box and then pulled the master fuse near the outside unit.

After that it was extremely simple. I took a picture of the current control board and all the wire placements so that I could hook them all up the same way. I then unplugged all the cables from the board, removed the screws, lifted it out, grabbed the new board, lowered it in, screwed it back in, put all the cables back on, replaced the fuse, and turned the power back on at the breaker box.

Once I turned the heat on from the thermostat it took a few minutes for the system to wake up but then it was fine. My heat pump runs like a champ again.

The HVAC guy was going to charge me $425 to do this job (that included the new board). I instead ordered the replacement board myself from repairclinic.com for about $110. The whole job took me less than 15 minutes. Saved $300.


If you're referring to a furnace, there may be some configuration involved, possibly including jumper/DIP switch settings and a startup test procedure. Ideally, your replacement board has some instructions with it. Update your question with more relevant detail for better help.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.