Find the make and full model name on the front panel, control flap or user documentation. Similar-looking boilers can have different controls, so include every letter and number shown.\n\nUse the manufacturer’s official manual library and select the user instructions, not an installer or service manual. Check that the product image, control layout and model reference match your boiler.\n\nKeep the manual link, serial information and any fault code together. This makes future troubleshooting and engineer conversations much easier.\n\nGeneric videos and forum posts can describe a different model or an older control panel. Never remove the casing or follow an engineer-only procedure. If the manual does not clearly authorise a homeowner action, ask for help.\n\nThe linked Worcester Bosch library is one official example. Baxi and Vaillant also maintain official literature libraries for their products.