Replacement for MaxxAir Circuit Board 10B21276KZ

Updated 01/05/2026 | Published 09/10/2024

Question:

What is the difference between circuit boards 10B21276KZ my board and 10A21276KZ your board

asked by: Marvin A

Expert Reply:

Hi Marvin; the Replacement Printed Circuit Board for MaxxAir Manual Lift RV Roof Vents # MA10A21276K won't be any different than your current 10B21276KZ and is the correct replacement. They have updated the model number over the years as they update fans. This is technically the 10C21276K now so it they have moved to C and replaced the A and B models that came before it.

expert reply by: Robin H

Robin H.

1/5/2026

Hey Marvin, how did things go with the replacement circuit board for your MaxxAir roof vent? Did the updated version work smoothly in place of your old one? Your feedback could help others sorting through the same model updates.

Marvin B.

1/5/2026

Hi robin, Yes, the circuit board worked great in our MaxxAir roof vent and I understand the fault in the design has been corrected so It will not short out again with moisture. The installation was easy if your a handy sort of person and it was a good opportunity to clean the blades and surrounding mechanisms completely. I was surprised, almost shocked, to find the motor was not brushless and that the brushes were worn down to the point of near failure already in less than 4 years of part time use. I turned the commutator and gave it some more life but assume the motor will need replacing in the near future. I will contact you when the time comes and hopefully we can come up with a brushless replacement. Thanks for your help with this project. Cheers Marvin