this post was submitted on 26 Jun 2026
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Maybe on a newer model somehow? But how does it get hot if the gas is not on to start with?
My old gas stove would kill you if you turned the knob without lighting.
It's a failsafe system. Gas fireplaces have something similar. Prior to being lit, the pilot/valve has to be held open manually. While holding it open, the ignitor can be used to light the gas. Sometimes this is simultaneous (opening & lighting), while other times it's two separate mechanisms. In either case, when the gas is lit, a device known as a thermocouple keeps the gas valve held open as long as there is heat. There are electrical and mechanical varieties. If at any time no heat is detected (or the thermocouple fails), then the valve is closed.
Fireplaces need regular maintenance and sometimes a thermocouple fails because it's dirty.
I assume that if the stove is lit up using matches then it doesn't have this feature?
No, despite how I worded it, the thermocouple does not specifically require a built-in ignitor. It's just a device that detects heat and closes a valve if not present. And mechanical thermocouples are incredibly simple devices, just a strip of metal with two different layers that bend when heat is present and returns normal when absent. They have been around forever. Similar tech to fuses really.
The big tell is if you have to manually hold the valve open to ignite the gas, as it does take a few seconds for the thermocouple to register a change. If you open the valve and immediately smell gas, then it is likely that you do not have a thermocouple.