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A thermocouple sits in the pilot flame to sense heat. It makes a tiny voltage when heated, which signals the gas valve that it is safe to stay open. If the flame goes out, the voltage drops and the valve shuts off fuel.
Specifications
- Part number: 369131-CLE
- Brand: Lincoln
- Part type: Thermocouple probe assembly
- Height: 0.5 in / 1.27 cm
- Length: 18.05 in / 45.85 cm
- Width: 10.25 in / 26.04 cm
- Type: thermocouple (mV) or thermopile, as listed
- Length: same or a little longer
- Fitting: same nut or terminals
From the maker's and parts sellers' listings for this number. Compare them with the label on your old part.
How This Thermocouple Probe Works
A thermocouple probe assembly is a heat-sensing safety device. The tip of the probe sits directly in the path of the pilot flame. As the flame heats the tip, the metal creates a small millivolt signal.
This small voltage travels down to the gas valve to hold it open. If the pilot flame blows out or fails to light, the probe cools down fast. Without that voltage, the gas valve closes right away to stop unburned gas from leaking into the equipment.
Understanding the Part Specs
When you compare your old probe to this part, the physical dimensions help you confirm the shape and routing path inside the unit.
The Lincoln 369131-CLE lists the following dimensions:
- Height: 0.5 in / 1.27 cm
- Length: 18.05 in / 45.85 cm
- Width: 10.25 in / 26.04 cm
Signs of Failure and Safe Replacement
A common sign of a failing thermocouple involves the pilot light. If the pilot lights while you hold the knob or button down, but goes out the moment you let go, the thermocouple is often the cause.
Follow these steps when checking or replacing the assembly:
- Shut off the gas supply completely before touching the assembly.
- Take a photo of the old probe, noting how it mounts near the pilot and connects to the gas valve.
- Carefully remove the old probe without bending nearby gas tubes.
- Position the new probe tip directly where the pilot flame can heat it.
- Connect the fitting snugly to the valve, matching the original path.
- Restore the gas supply and test the pilot according to the maker's instructions.
Read your old part
- Locate the stamped part number on your existing probe, bracket, or equipment manual.
- Confirm the part number reads 369131-CLE.
- Verify the probe length is 18.05 in / 45.85 cm so it reaches the valve without strain.
- Check that the connection type matches your valve fitting or nut style.
When to call a pro
Working with gas lines requires care and precision. If you are unsure about removing fittings, setting flame contact, or testing for leaks, stop and call a licensed HVAC technician.
Questions
What does a thermocouple do?
It makes a tiny voltage when the pilot heats it. If there is no voltage, the gas valve closes for safety.
How do I know if my thermocouple has failed?
The pilot lights while you hold the button, then goes out when you let go. That is a common sign of a weak or broken thermocouple.
What should I do if I smell gas while checking the part?
Do not touch any electrical switch. Leave the building immediately and call your gas company from outside.
Can I use a thermocouple with a different length?
A replacement thermocouple should have the same length or be a little longer. It must reach comfortably from the pilot flame bracket to the valve without being pulled tight.
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