Gas Stove Top Hob Burner Not staying lit, Thermocouple How it works & Test if lights but goes out

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19.7 هزار بار بازدید - 7 ماه پیش - Greetings, and welcome to our
Greetings, and welcome to our guide on hob and oven repair. If you are experiencing issues with your appliance where the flame goes out upon releasing the knob, do not fret. The flame should remain lit after holding the knob down for a few seconds – let us explain why this may not be happening and demonstrate how to test it.

We have dissected a gas valve to better illustrate the inner workings. The thermocouple, invented in the 1800s by Thomas C. Beck, generates a small amount of direct current (DC) electricity. This electrical current flows to an electronic valve within the gas valve. When you press the knob down, you bypass this electronic valve, allowing time for the thermocouple to reach its operating temperature. Upon release, the valve should remain open due to the constant DC current keeping it active.

To test for potential faults, we have set up a demonstration using a dissected valve and a thermocouple. When the plunger or valve is pressed down without heat applied to the thermocouple, it does not lock in place. However, once heat is introduced and the plunger is pressed down, it locks into position. Removing the heat source causes the valve to unlock after a predetermined period, ensuring your gas appliance remains safe.

Testing a thermocouple's energy output is straightforward – simply set your meter to measure millivolts of DC electricity. For twin-wire versions, connect to the outer rim (positive) and inner rim (negative) before positioning the thermocouple into a flame. Thanks to the Seebeck effect, discovered in 1800, introducing a flame will cause the thermocouple to produce energy.
Learn how to disassemble and repair your appliance with ease and confidence. 🧰
Discover the subtle signs that indicate deeper issues within your gas stove. 🕵️‍♂️
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