Skip to Content

Why won t my new thermocouple stay lit?

Your new thermocouple may not be staying lit for several different reasons. First, it is possible that the thermocouple is not receiving enough voltage from the gas control. A replacement thermocouple should deliver at least 25 millivolts, and it’s likely that the one you currently have is not delivering this amount.

Additionally, it may be the case that your pilot light flame is not touching the thermocouple, or that the gas mixture is incorrect. If you’ve checked these potential issues, you may also want to inspect the thermocouple for corrosion or deposits that may be interfering with the flow of electricity.

It is also a possibility that the thermocouple is faulty. It may be necessary to replace it in order to keep the pilot light lit.

Why won’t pilot stay lit with new thermocouple?

The thermocouple is a safety device used to regulate the flow of gas to an appliance, such as a furnace or a pilot, and is often used to create a more consistent and safer way to heat a structure. When a new thermocouple is installed, the pilot should stay lit—otherwise, the appliance won’t work correctly.

If the pilot won’t stay lit even with a new thermocouple, it’s most likely due to gas supply or airflow problems.

The first thing to check is whether the gas supply is connected properly to the appliance. If not, or if the gas pressure is not adequate, the pilot won’t stay lit. It could also be due to a blockage or obstruction in the gas line, or if the regulator is not working properly.

Another potential issue could be related to the thermocouple and its installation. The thermocouple must be properly grounded, and the contacts must be clean and free of corrosion. If the thermocouple is too far away from the pilot flame, or if the flame is too low, the thermocouple will not generate enough voltage to stay lit.

Additionally, it is important that the pilot flame size is adjusted correctly, as the thermocouple needs to be in a certain range to stay lit.

Finally, airflow is an important factor, as air needs to be circulating enough for the pilot to stay lit. If the pilot is not getting enough air, it won’t stay lit. Make sure the vent isn’t blocked and that the intakes and exhaust are clean.

In conclusion, if the pilot won’t stay lit with a new thermocouple, the most likely culprit is gas supply or airflow problems. Be sure to check the gas supply and connection to the appliance, clean and check the thermocouple and its grounding, as well as any blockages in the gas line.

Additionally, make sure the pilot flame is adjusted correctly and that airflow is adequate.

Why does my thermocouple keep going out?

Your thermocouple may be going out due to a number of reasons. The most common causes are dirt or debris blocking the pilot light, a clogged gas line, a failed parts like the thermocouple or thermopile, a bad connection due to corrosion, a failing thermopile, or a gas supply that is under-pressured or not flowing properly.

To remedy this, it’s best to start by visually inspecting the pilot light area to make sure there is no dirt or debris blocking the flame from coming in contact with the thermocouple. If that doesn’t work, check the gas line for signs of clogs or kinks.

Next, check for corrosion on the connections between the gas valve, thermocouple and thermopile. If corrosion is present, you will need to clean and reconnect the parts in the correct order before relighting the pilot.

You may also need to check the thermopile for any signs of faulty or worn components, or you may need to check the gas supply for proper pressure. Finally, if nothing else works, you may need to replace the thermocouple or thermopile.

Why does my pilot light go out when I release the pilot light knob?

When the pilot light knob is released, the gas flow that was keeping the pilot light on is cut off and the flame will extinguish. The pilot light is kept lit when the knob is held down by the thermocouple, a device that senses heat and opens the unlockable valve when heat is detected, allowing the gas to flow.

When the knob is released and the valve is closed, the thermocouple stops sensing heat and shuts off the gas supply, which causes the pilot light to go out.

How long does it take for a new thermocouple to heat up?

The exact time it takes for a new thermocouple to heat up will depend on a variety of factors, such as the type and size of the thermocouple, the ambient temperature, the rate of energy supplied to it and the energy output required.

Generally speaking, however, it may take anywhere from milliseconds to minutes for a new thermocouple to reach its target temperature. In some cases, the thermocouple may take even longer to heat up if it is exposed to cold temperatures or if the rate of energy supplied to it is low.

Generally, the higher the wattage, the faster the heating time. Conversely, the lower the wattage, the slower the heating time. Additionally, if a thermocouple is exposed to outside temperatures that are much colder than the device’s target temperature, it will take much longer to heat up.

How do you fix a pilot light that won’t stay lit?

If your pilot light won’t stay lit, it’s important to identify the cause of the issue before you try to fix it. First, check that the thermocouple is clean and attached securely to the pilot burner. If that looks good, ensure that the cylinder is not leaking and the flame is centered on the tip.

If the pilot light still won’t stay lit, it may need to be adjusted. Use an adjustable wrench to gently turn the gas adjust screw until the pilot light is in the correct position. This can sometimes be difficult, so proceed slowly and with caution.

If the pilot light issue persists, you may need to clean or replace the thermocouple. If all of these steps fail, contact a qualified professional to inspect and repair your gas appliance.

How much should you tighten a thermocouple?

When tightening a thermocouple, it is important to not overtighten, as this can cause extra strain on the thermocouple and cause a decrease in accuracy or even damage the device. Generally, the thermocouple nut should be tightened to just beyond finger tight.

This is generally when a socket or wrench is required to tighten further. If the thermocouple is tightened too much, it can leave a small indentation in the surface of the fitting of the thermocouple.

To test the level of tightness, you can use a torque wrench to ensure that you have achieved the correct level of tightness. When using a torque wrench, you should ensure that you select a torque value which is appropriate for the size of the thermocouple.

Why do I have to keep relighting my pilot light?

The pilot light in your appliance is an important part of how it operates. Keeping it lit is essential for the appliance to function properly.

A pilot light must remain lit in order to trigger the main burner to ignite to create the desired heat. If the pilot light goes out, the main burner will not activate until the pilot light is relit. This is important for safety reasons, since a main burner that is not lit properly can produce carbon monoxide gases that are dangerous to your health.

A buildup of dirt, dust, and debris can cause the pilot light to become clogged, preventing the flame from staying lit. Additionally, a small draft, such as from a fan or window, can cause the pilot light to be blown out.

A gas leak, worn out parts, improper installation, or an incorrect gas pressure settings can all cause the pilot light to become extinguished.

If you are having trouble keeping the pilot light lit, you should have a qualified technician take a look at it. Make sure to follow all instructions provided by the technician and take extra precautions when relighting the pilot light yourself.

Doing so can help to keep your appliance safe and running correctly.

What problem will cause if the thermocouple is not receiving the flame?

If the thermocouple is not receiving the flame, it will no longer be able to create a voltage to complete the electrical circuit it needs to operate. This will cause the appliance the thermocouple is connected to not to work properly or possibly not work at all.

Without a working thermocouple, the appliance will be unable to detect when its burner has been extinguished, or when its pilot light has been shut off. This could be a dangerous situation as the appliance would remain on with no way to automatically shut it off, potentially leading to fire hazards.

In addition, when the thermocouple is not receiving the flame, it can cause the appliance to malfunction in other ways, such as failing to ignite correctly or even producing insufficient heat. Therefore, it is important to make sure the thermocouple is functioning correctly and always receiving the flame.

Are thermocouples universal?

The short answer is “no. ” Thermocouples are not universal. Different thermocouples have different capabilities and limitations. For example, some thermocouples may be designed to measure specific temperatures, while others are designed to operate within a particular temperature range.

Different thermocouples also vary in terms of response time, accuracy, and durability. Therefore, it is important to determine the specific requirements for an application before selecting the appropriate thermocouple.

Additionally, it is important to bear in mind that thermocouples from different manufacturers may be incompatible with each other, so it is important to select thermocouples from a single manufacturer.

How long should a thermocouple last?

Thermocouples typically last 5-10 years when used correctly, with some lasting up to 15 years or more. This can depend on the type of thermocouple, application, and environmental conditions. For instance, thermocouples used in harsh climates, or those facing stressful environments, may have a shorter life-span.

High-quality thermocouples, such as those made from high-value metals, may last longer than those made from lower-quality materials. Proper maintenance and installation is also important for extending the life-span of a thermocouple.

For example, shielding the thermocouple from direct exposure to flames or extreme heat can help keep the lifespan at the upper range of 5-10 years. It’s also important to keep the thermocouple clean and free from dirt or dust, as this can interfere with its accuracy.

If a thermocouple is not performing as it should, it’s important to check its wiring and make sure everything is securely connected. It’s also wise to check the calibration of the thermocouple and make sure it is within the manufacturer’s specifications.

With proper care, a thermocouple can be expected to last 5-10 years or even longer.

What can damage a thermocouple?

Thermocouples can be damaged by a variety of factors, including extreme temperatures, corrosion, vibration, physical damage, and faulty installation. Excess temperatures can damage the thermocouple wires and junction, leading to poor accuracy and failure.

Excess vibration can cause the wires to break; physical damage can cause bends and kinks in the wires; and faulty installation can lead to inaccurate readings and poor performance. Corrosion can also cause damage and reduce the accuracy of the thermocouple if the wires and junction are not properly protected against moisture and chemicals.

Additionally, if thermocouple wires and junctions are subjected to rapid temperature changes, they run the risk of developing cracks in their insulation and ground connections. To protect against these potential issues, thermocouples should be installed and maintained properly, and be kept away from extreme temperatures and hazardous chemicals.

What happens if you wire a thermocouple backwards?

If you wire a thermocouple backwards, it will still measure temperature, but the output will be incorrect. This is because thermocouples measure temperature by creating a small amount of electrical current in response to a temperature difference between two points.

When the thermocouple is wired correctly, the two points are correctly matched and the temperature is read correctly. However, if the thermocouple is wired backwards, then the two temperature points become mismatched and the resulting temperature measurement will be inaccurate.

This could lead to a malfunction in the system, and in some cases, it could even be hazardous. To prevent this from happening it is important to check your wiring regularly and to make sure the thermocouple is properly connected according to the manufacturer’s instructions.

Can I bypass a thermocouple?

No, you cannot bypass a thermocouple. A thermocouple is a device that measures temperature by converting thermal energy into electrical energy. It consists of two dissimilar metal wires that are joined at one end and exposed to a temperature at their other end.

The electrical energy produced at this junction is directly proportional to the temperature. So, it is not possible to bypass the thermocouple, as it is responsible for detecting and measuring the temperature.

Furthermore, bypassing the thermocouple can lead to erroneous readings and weaken the overall accuracy of the instrument.

Why does my pilot light keep going out after replacing thermocouple?

After replacing your thermocouple, it is possible that the pilot light keeps going out due to a couple of different possible issues. Firstly, the thermocouple may not be correctly installed. If the thermocouple is not in the proper position, or not properly connected to the gas valve, it will not be able to detect the heat of the pilot flame, and will not be able to keep the flame lit.

Similarly, the thermocouple may not be the correct size or type for the particular appliance that you are using. In order to ensure the thermocouple is correctly installed, you will need to consult the user manual for your appliance.

If the thermocouple is correctly installed, you may need to clean your burner. The pilot light should be burning cleanly and steadily, with no yellow or orange-tipped flames. If the burner is blocked or dirty, the flammable air and gas combination won’t be correct, which will cause the pilot light to go out.

To clean the burner, you’ll need to remove it and carefully clean away any blockages or dirt.

Finally, it is also possible that the appliance is not receiving enough gas. If your gas supply is too low, the flame will not be able to stay lit. To check whether this is the issue, you should check the gas pressure at the regulator, using a manometer.

If you find that the pressure is too low, you will need to contact your gas supplier to top it up.