Method and circuit for self-checking troubles of a heating system

A method and circuit for self-checking problems in a heating system for an automobile are disclosed. A self-checking and indicating process are disclosed which include a first preheating step; an ignition period; a second preheating step; a combustion period module; and an extinguishment step according to a program interrupt. Various checking steps are included, along with various subroutines for indicating errors. Errors are displayed and a stopping step is performed if the temperature checked and the various proceding checking steps indicate that error conditions exist. The present invention includes an indicating apparatus which includes an output part of a microprocessor which provides a fundamental memory, a data processor, an arithmetic and logic accumulation, and an interrupt. The microprocessor is connected to an output part of a driving apparatus, and a sensing part which senses the driving state of the output part, the ignition, the temperature, and a low voltage condition. The microprocessor communicates data with a timer display to indicate progressing control and a buzzer driving part.