A control apparatus comprising: a first sensor for detecting an internal temperature (TPWB) of the control apparatus, a second sensor for detecting an external temperature (TOIL) of the control apparatus, and internal memory media for storage of information that has been created inside the control apparatus, characterized in that the control apparatus is adapted to performing the step of: when the temperature (TPWB) obtained from said first sensor exceeds the sum of the temperature (TOIL) obtained from said second sensor and of a first required temperature, first failure information is stored onto said internal memory media indicating that a control apparatus failure due to a control apparatus internal failure has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur, and when the temperature (TOIL) obtained from said second sensor exceeds a sum of the temperature (TPWB) obtained from said first sensor and of a second required temperature, second failure information is stored onto said internal memory media indicating that a control apparatus failure due to a failure in an apparatus external to the control apparatus has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur. a first sensor for detecting an internal temperature (TPWB) of the control apparatus, a second sensor for detecting an external temperature (TOIL) of the control apparatus, and internal memory media for storage of information that has been created inside the control apparatus, characterized in that the control apparatus is adapted to performing the step of: when the temperature (TPWB) obtained from said first sensor exceeds the sum of the temperature (TOIL) obtained from said second sensor and of a first required temperature, first failure information is stored onto said internal memory media indicating that a control apparatus failure due to a control apparatus internal failure has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur, and when the temperature (TOIL) obtained from said second sensor exceeds a sum of the temperature (TPWB) obtained from said first sensor and of a second required temperature, second failure information is stored onto said internal memory media indicating that a control apparatus failure due to a failure in an apparatus external to the control apparatus has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur. when the temperature (TPWB) obtained from said first sensor exceeds the sum of the temperature (TOIL) obtained from said second sensor and of a first required temperature, first failure information is stored onto said internal memory media indicating that a control apparatus failure due to a control apparatus internal failure has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur, and when the temperature (TOIL) obtained from said second sensor exceeds a sum of the temperature (TPWB) obtained from said first sensor and of a second required temperature, second failure information is stored onto said internal memory media indicating that a control apparatus failure due to a failure in an apparatus external to the control apparatus has occurred, wherein said sum is below a temperature at which an internal element failure in the control apparatus is likely to occur.