The Baxi 5121025 Printed Circuit Board (PCB) Enclosed is a genuine replacement electronic control module designed to manage the core functions of your boiler. This enclosed control board coordinates ignition sequencing, pump and fan operation, safety monitoring, sensor inputs and diagnostic functions to ensure smooth, efficient heating and hot water performance. Integrated safety logic and fault detection help protect internal systems and support accurate troubleshooting when issues arise.

This printed circuit board is compatible with Baxi Combi and Promax series boilers that specify part number 5121025 in their parts documentation. To ensure correct fitment and operation, always verify the part number on your existing control board or consult your boiler’s service information before installation, as control modules are model-specific and vary by appliance type and control system.

Supplied ready for direct replacement, the 5121025 PCB connects seamlessly with the boiler’s existing wiring harness and sensor interfaces without modification when installed by a qualified engineer. Choosing this genuine Baxi electronic control board helps restore dependable central control, reliable operation and improved system responsiveness in compatible Combi and Promax boilers.