When a furnace's pilot light refuses to stay lit, the culprit is often the —a critical safety device that converts heat from the pilot flame into a small electrical voltage to keep the gas valve open. Finding a replacement is a straightforward task, but choosing the right source depends on whether you need a quick fix or a specialized component. Where to Buy a Furnace Thermocouple
For most residential gas furnaces, you can find universal thermocouples at major home improvement retailers, specialized HVAC suppliers, or online marketplaces. where to buy a thermocouple for furnace