Question: Can You Clean A Thermocouple?

Why does my pilot light keeps going out?

If the pilot light goes out, the thermocouple senses the drop in temperature and signals for the gas valve to close.

If you have a faulty thermocouple is the most common reason that your pilot light is malfunctioning.

Over time your water heater will collect dirt, dust and other kinds of debris..

How much does it cost to fix a thermocouple?

The thermocouple is an apparatus that senses whether the pilot light is lit and triggers the gas control valve. Repairs typically cost about $150 to have it done professionally, though a new thermocouple itself only costs about $20 on average.

Where should thermocouples be placed?

Even more important – thermocouples MUST be placed well inside the edge of any heating blanket. These blankets are cooler within about 5cm (2”)of the edge, and are quite cool very near the edge, within about 2cm (1”).

What is the purpose of a thermocouple?

Thermocouples are sensors used to measure temperature. It is a device used inside a gas furnace in Kansas, to assist the pilot light in keeping your furnace running and safe. It works rather like a fail-safe to keep unburned gas from accumulating and burning, exploding or causing another type of health risk.

Can you bypass a thermocouple?

So if you want to bypass the thermocouple you have to get rid of the spring mechanism. You can bypass the spring mechanism by simply using a screwdriver to pop out the little e-clip and take the valve off and problem solved.

Can a thermocouple work intermittently?

a safety device that has started to go bad, or has failed permanently. In this client’s case, the thermocouple was initially working intermittently, and then finally failed. … This allowed the gas to flow long enough to heat up the thermocouple and generate some electrical current flowing back to the gas valve.

Is there a difference in thermocouples?

Thermocouple vs. Temperature range: First, consider the difference in temperature ranges. Noble Metal Thermocouples can reach 3,100 F, while standard RTDs have a limit of 600 F and extended range RTDs have a limit of 1,100 F. … RTDs are also more stable and have better linearity than thermocouples.

Is it hard to replace a thermocouple?

If no flame is present, the sensor stops or prevents the flow of gas from the gas valve, thus preventing the dangerous situation of gas flowing into the appliance when there is no flame to burn it. Flame sensors and thermocouples are simple parts that wear out and fail over time, and most are easy to replace.

How do I know if my thermocouple is accurate?

To determine the initial accuracy of a thermocouple, you simply determine the greater of the two tolerances given. Note that standard and special tolerances for thermocouples are determined using the same method. Multiply 300°C by ±0.0075 which gives ±2.25°C.

What happens if a thermocouple is wired backwards?

If you accidentally reverse the polarity of the thermocouple lead wires, the measured temperature will be incorrect by the difference in temperature of the two ends of the leads.

What is the resistance of a thermocouple?

The resistance of a thermocouple is simply the series resistance of the two wires of dissimilar metals in the circuit. This wire resistance simply depends on the wire materials, the wire cross sections, and the total length of the wires.

Should the flame touch the thermocouple?

The pilot flame should touch the thermocouple at a specific level. If the flame is blue and weak, and barely reaches the thermocouple, it needs to be stronger. If it extends well above the thermocouple, it’s too strong.

Does Home Depot sell thermocouple?

Thermocouple/Thermopile – Water Heaters – Plumbing – The Home Depot.

Does length of thermocouple matter?

The length of a thermocouple has no effect on its measurement accuracy or its ability to transfer the signal to the instrument. In other words, thermocouples do not experience “voltage drops” or power loss along its length as a high current power line might possess.

Can you replace a thermocouple yourself?

It’s easy to replace and a new one costs $5 to $10. Rather than trying to unfasten the thermocouple inside the water heater’s burning chamber, it’s easier to remove the whole burner and thermocouple assembly. … Then unfasten the three nuts that hold the thermocouple and the two gas tubes to the valve.

Can you replace a thermopile with a thermocouple?

A thermopile will generate more electricity than a thermocouple and usually has a different type of electrical connection. You should use a replacement with the same specifications as the original or your gas control may not function properly.

How do you adjust a thermocouple?

Adjusting the Thermocouple Correcting the first condition is a simple process. Simply shut off the gas, reach under the burner and push or pull the probe to reposition it. If the thermocouple is faulty, remove it by unscrewing it from the burner and pulling it out. Reverse the procedure to install a new one.

How do you know if you have a bad thermocouple?

If you can’t get the flame to light at all, and you’re sure the gas is on, there’s probably an obstruction in the pilot tube. If the flame lights and goes out when you release the gas control knob after holding it in for the recommended 20 to 30 seconds, that’s the sign of a thermocouple malfunction.

Can you sand a thermocouple?

Water Heater Thermocouple Cleaning in 5 Steps Cut the fuel supply to the water heater. This is always the first step when working on a water heater. … Clean the thermocouple – using the emery cloth sandpaper, sand the ends of the thermocouple and then give it a finishing touch with the lint-free cloth.

What causes a thermocouple to go bad?

The presence of oxygen causes a reaction in the thermocouple that can wear down the part and make the wires become thinner and more brittle. Oxidation can be caused by a small amount of oxygen making its way into a sealed environment and reacting with the pure metal of the thermocouple.

Will a pilot light on a thermocouple go bad?

When the pilot goes out, this component send a signal to the gas valve to make sure that it remains closed while the pilot light is not yet lit. This means that if the thermocouple goes bad, there is no way of detecting if the pilot light is burning or not.

How do you test a thermocouple with a meter?

MultiMeter Thermocouple Test Procedure First, remove the thermocouple. Secondly, turn on the meter and set it to Ohms. Touch the two leads together from the meter, and you should get a reading close to zero. With the leads apart, you will read infinity.

Do thermocouples wear out?

Like the other component parts in your furnace, the thermocouple can wear down over time, producing lower voltage than it should when heated. And the worst part is that you can have a bad thermocouple without even knowing. Therefore, inspecting and testing your thermocouple should be part of your furnace maintenance.

How do you clean a dirty thermocouple?

Use a piece of steel wool or the abrasive side of a sponge to gently remove the soot without damaging thermocouple. Avoid using cleaning products, especially those containing flammable chemicals. Use a pencil eraser to clean between the threads of the screw that attaches the thermocouple.

What’s the difference between a thermopile and a thermocouple?

The main difference between Thermocouple and Thermopile is their method of measurement. The thermocouple is a thermoelectric instrument, while the thermopile is an instrument that modifies thermal energy into electrical output.

What does a thermocouple look like?

The thermocouple looks like a piece of metal tubing smaller than a soda straw. To find it, first locate the gas control box. This is the box that the main gas line enters, where you turn the gas on in the furnace. (On most furnaces, it also houses the button that you hold open or push to relight the pilot.)

How long do thermocouples last?

10 yearsMainly, the thermocouple lasts for 10 years. But, when it fails, the pilot does not lit up and so the fireplace stops working. So, a thermocouple is an important device in the functioning of a fireplace.

Are thermocouples universal?

Universal Thermocouples. Universal thermocouples, as the name implies work on most water heaters. They are available online and in home supply stores for a reasonable cost. The length and the thread type are the two concerns when purchasing one.

How much should a plumber charge to replace a thermocouple?

Calling a professional plumber to install a new thermocouple should only be up to $150. If you do the work yourself, you will only pay the price of the part which is about $20.