Abstract: A lubricating system including a fluid distribution system for distribution a lubricating fluid to one or more parts of an operating machine and a control system for controlling the operation of the fluid distribution system is disclosed. The control system generates a system fault signal, which disables the machine being lubricated, a predetermined time period after a fault condition in said fluid distribution system is detected. A fault condition is detected in part by monitoring the output of a low pressure sensor which generates a low pressure fault signal whenever the pressure in the fluid distribution system falls below a predetermined level. Circuitry is provided for ensuring that a system fault signal will not be generated in response to an erroneous low pressure fault signal which may be generated during the initial pressurization of the fluid system.