A method is disclosed for delivering energy to a region of tissue within a patients body using a medical treatment system. The medical treatment system comprises an energy delivery device coupled to an energy source. Energy is delivered through the energy delivery device positioned within the patients body. An energy delivery parameter associated with the delivery of energy by the medical treatment system is monitored and if one or more values of the energy delivery parameter exceed a predetermined magnitude threshold, one or more errors are detected. The extent of the detected errors is determined or assessed and the delivery of energy is controlled if the extent of the errors detected exceeds a sensitivity threshold before the expiry of a predetermined time period.
