Abstract: 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.

Abstract: This invention relates to an auxiliary heating system for vehicles which is intended for effective heating of vehicles by installing it together with a pre-existing vehicle heating system. This invention utilizes a modified boiler with an improved burner as a heat source instead of engine waste heat. In addition, the invention features various kinds of safety devices. The invention provides for increased efficiency in the heating of a vehicle and yet represents an inexpensive heating system. The invention also expands the scope of vehicles in which the above heating system can be installed by decreasing the weight and lessening the size of the boiler.