Patent ID: 8147239

Claim:
A method of controlling a gas type clothes dryer, comprising: operating an ignition device according to an operation signal; opening a gas valve after stopping operation of the ignition device; determining whether the gas valve is in an error state by detecting whether a flame has been extinguished after opening the gas valve; progressing a drying cycle while maintaining an open state of the gas valve according to a determination result as to the error state of the gas valve; and continuously determining whether the gas valve is in the error state during the drying cycle, wherein the gas valve is determined as being in the error state when it is determined that a condition of a flame sensor still indicates a flame extinguished state even after repeating a series of procedures of closing the gas valve, performing the ignition, and opening the gas valve a predetermined number of times based on a determination that the condition of the flame sensor indicates the flame extinguished state, and wherein the closing the gas valve comprises simultaneously closing a primary gas valve and a secondary gas valve.