Combustion fan 2506 is now supplied without the Bulgin plug. This is due to the Bulgin plug (pt. no. PX0649) now being obsolete. To enable connection of the 2506 combustion fans to the radiant burner a spares kit is offered - part No 2506-1023612. https://www.reznor.co.uk/product/id-fan-au076072-no-plug-c-w-burner-wiring-kit/
Is part No. 2506 supplied with the plug?
General technical information about Reznor's products