Method of monitoring a control operation of a medication delivery system, determining whether a signal level received from an analyte sensor is associated with a fault condition and a potential fault condition, and adjusting a medication delivery rate executed by the control operation when it is determined that the signal level from the analyte sensor is associated with one of the fault condition or the potential fault condition, where the medication delivery rate is adjusted to a first predetermined range when the signal level is associated with the fault condition, and adjusted to a second predetermined range when the signal level is associated with the potential fault condition is provided. Devices, systems and kits for implementing the afore-mentioned method are also provided.