The Worcester Bosch 87172010520 Transformer is a genuine replacement electrical component that provides the correct low-voltage supply needed by your boiler’s control system. By stepping down mains voltage to the safe operating level required by control boards, sensors, safety devices and actuators, this transformer ensures stable, reliable power delivery to sensitive electronics. A properly functioning transformer helps protect control circuitry from electrical stress, supports accurate ignition timing and reduces the risk of erratic behaviour or fault codes caused by unstable voltage.

This transformer is compatible with Worcester Bosch CDi, Greenstar and Highflow series boilers that reference part number 87172010520 in their technical documentation. To ensure correct fitment and dependable performance, always verify the part number on your existing transformer or consult your boiler’s service information before installation, as transformer specifications and connection formats vary between models and control platforms.

Supplied ready for direct replacement, the 87172010520 Transformer integrates with the boiler’s existing wiring harness and mounting points without modification when installed by a qualified engineer. Choosing this genuine Worcester Bosch component helps restore proper power supply to your control system, supports stable boiler operation and contributes to efficient, reliable heating and hot-water performance in compatible boilers.