Worcester Bosch 8716121817 Set of Electrodes

A genuine Worcester Bosch OEM electrode set, designed to restore reliable ignition and flame detection on older Greenstar CDi and Highflow boiler models. As electrodes wear over time, ignition can become unreliable or flame sensing inconsistent — fitting a genuine replacement set brings ignition performance back to factory standard. This part supersedes the earlier Worcester code 87186643010, and covers a wide range of Worcester and British Gas-branded Greenstar CDi models, including several 30CDI, 34CDI, 37CDI, 40CDI and 42CDI variants in both natural gas and LPG. It's built specifically for pre-2019 Worcester boilers — always check your boiler's data plate or model number to confirm fitment before ordering. Installation must be carried out by a Gas Safe registered engineer. ? * See Technical Attachments for more details.