The Baxi 5114777 Wiring Harness is a genuine replacement electrical assembly designed to connect key components within your boiler to the main control system, ensuring reliable power and signal distribution throughout the appliance. This harness routes connections between the control board and essential parts such as sensors, fans, pumps, ignitors and safety devices. A worn, damaged or corroded wiring harness can lead to intermittent faults, loss of communication between components or boiler lockouts, so fitting the correct OEM harness helps restore dependable electrical integration and stable operation.

This wiring harness is compatible with Baxi boilers that specify part number 5114777 in their parts documentation. To ensure correct fitment and reliable performance, always verify the part number on your existing harness or consult your boiler’s service information before installation, as harness lengths, connector types and routing paths vary between models.

Supplied ready for direct replacement, the 5114777 Wiring Harness integrates seamlessly with your boiler’s existing wiring looms and mounting points without modification when installed by a qualified engineer. Choosing this genuine Baxi component helps maintain correct electrical communication, supports dependable operation and reduces the risk of control faults in compatible boilers.