Looking For A Replacement Circuit Board For My MaxxAir Fan Part 10B24275N

Updated 09/15/2026 | Published 07/31/2025

Question:

I am looking for a circuit board for a maxxair fan part 10B21275N I am running this on a firefly system

asked by: Alan S

Expert Reply:

Hey Alan,

The correct replacement circuit board for your MaxxAir Fan 10B21275N is going to be the replacement board # MA10A21275K. This will be a direct replacement for you and get your fan back up and running.

expert reply by: Nick S

Alan S.

8/18/2025

Hi Nick, I took apart the fan and saw that the new board has cat 5 connections for control. My current board uses 4 pin connector, so this creates quite a dilemma as I have no idea what pin does what. Is their an addapter available?.

Nick S.

8/18/2025

@AlanS Do you know what model fan you have? It does look like there is a certain model fan and manufacturer date that this works on and yours may be older. If you can find the fan model number I can take a look and see if I missed something and see if there is an adapter.

Alan S.

8/18/2025

@NickS yes the model # 4900N s/n 2104-4900N-0121

Nick S.

8/22/2025

@AlanS Thank you for getting me that information. I have reached out to MaxxAir with that information to see if there is something I am missing, or maybe an adapter that I am not aware of. When I hear back I will reach out and let you know what we can do moving forward.