The Worcester Bosch 87161203450 Flame Sensor and Harness is a genuine replacement safety and feedback component designed to detect and relay the presence of a stable flame during combustion in your boiler. The flame sensor works by monitoring the flame’s electrical characteristics and sending a signal back to the control board. If the sensor does not detect a proper flame within a set time, it prompts the boiler to shut down the ignition sequence to prevent unsafe operation. The integrated harness provides the correct wiring connection between the sensor and the control electronics.

This flame sensor and harness assembly is compatible with Worcester Bosch CDi and Junior series boilers that specify part number 87161203450 in their parts documentation. To ensure correct fitment and reliable performance, always verify that the part number matches your existing sensor/harness or consult your boiler’s service information before installation, as flame sensing components and connector layouts vary between models.

Supplied ready for direct replacement, the 87161203450 Flame Sensor and Harness integrates with your boiler’s existing burner assembly and control wiring without modification when fitted by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore accurate flame detection, supports safe burner operation and contributes to consistent, trouble-free heating and hot-water performance in compatible CDi and Junior boilers.