Gas appliance and control method thereof

A control method for a gas appliance, wherein the gas appliance includes a burner, a gas valve, an ignitor, and a thermocouple, wherein the burner includes at least one flame port;

• the gas valve is disposed on a gas pipe communicating with the burner, and is controllable to open or block the gas pipe;
• the ignitor is disposed adjacent to the at least one flame port of the burner, and is controllable to ignite gas output from the at least one flame port;
• the thermocouple is disposed adjacent to the burner, and is adapted to sense flames and output a corresponding sensing voltage;
• the control method comprises steps of:
• A. controlling the ignitor to ignite, and controlling the gas valve to open the gas pipe;
• B. receiving the sensing voltage output from the thermocouple;
• C. stopping the ignitor from igniting and controlling the gas valve to keep the gas pipe in an open state based on the sensing voltage output reaching to a first threshold voltage;
• and
• D. receiving the sensing voltage output from the thermocouple continuously, and controlling the gas valve to block the gas pipe in response to the sensing voltage output changing from being decreases from higher than a second threshold voltage to being lower than the second threshold voltage, wherein the second threshold voltage is higher than the first threshold voltage, and
• controlling the gas valve to block the gas pipe based on the sensing voltage output being is lower than the second threshold voltage for a predetermined period of time.