The thermocouple technically called a thermocouple junction is a device that contains two metal wires welded at the ends and placed inside a protective metal case.
Furnace pilot light parts.
Get a needle and scrape the inside of the pilot tube.
Choose from silicon carbide and silicon nitride hot surface igniters with flat round and spiral tips.
The thermocouple sensor is found at the business end of the pilot flame and is designed to be placed in the hottest part of the flame.
In these systems the pilot will only light in the case of hot surface igniters the igniter surface heats when the thermostat makes a command for heat.
If the igniter is cracked or defective the furnace won t heat.
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So cleaning it is an easy solution without having to replace any parts.
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The igniter gets very hot and glows bright orange to light the gas burner.
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All you will need to clean the pilot tube is a needle.