Florida Home Inspector Practice Test

The function of confirming the ignition of the pilot light in gas appliances is typically performed by a thermocouple. This device is a safety feature that consists of two different metals joined at one end. When heated by the flame of the pilot light, the thermocouple generates a small voltage. This voltage signals the gas control valve to remain open, allowing gas to flow to the burner. If the pilot light goes out, the thermocouple cools down, and the voltage drops, which causes the gas control valve to shut off the flow of gas, thereby preventing potential gas leaks and hazards.

Other devices mentioned have different roles; for example, ignitors are used to initiate the ignition process, while thermostats measure temperature for regulation purposes, and flame sensors detect the presence of the flame but don't maintain the gas flow safety mechanism like a thermocouple does.