Quick Answer: Can You Fix A Thermocouple?

Is it expensive to replace a thermocouple?

1 cause of pilot lights that won’t stay lit is a worn-out thermocouple.

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..

Can hot water heaters be repaired?

A water heater can certainly be repaired, generally depending on what is going on when a plumber is called out for water heater repair. As per the common problems listed above, the general consensus for these tends to be a parts replacement, a reset of the system, or a flush of your water heater.

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.

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.

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.

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.

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.

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.

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 clean a thermocouple?

The best way to clean your thermocouple is to use either a piece of steel wool or the coarse side of a sponge to gently clean off any soot or other remnants. You can use a pencil eraser to clean between the threads of the screw that connects the thermocouple to the control valve of your system.

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 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.

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.

How long should a thermocouple last?

one yearIn effect, new thermocouples were installed into contaminated tubes, causing the degradation of the sensors and generating greater than a 100°F shift in accuracy. In this scenario, thermocouple life, which should have been close to one year, was shortened to within a week.

What happens if a thermocouple fails?

When a thermocouple fails in your control system, bad things happen. The impact may be minimal, or it can mean hundreds of thousands of dollars in lost product or delayed production. Just the fact that you have to shut down and replace a thermocouple means lost revenue.

Do you call a plumber to fix a hot water heater?

Well, it depends on the issue. But for the most part, you should call a licensed plumber for all hot water heater problems. … (We have both plumbers and electricians.) Our experts can repair your water heater and get the hot water flowing in your home again.

How much does a plumber charge to flush a water heater?

Most water heater flushing jobs will cost in the $80 to $100 range, water heater contractors say.

How does a thermocouple work?

A thermocouple is a sensor that measures temperature. It consists of two different types of metals, joined together at one end. When the junction of the two metals is heated or cooled, a voltage is created that can be correlated back to the temperature. … Thermocouples are commonly used in a wide range of applications.

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.

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.

How do you check a thermocouple?

Place one test lead on the side of the thermocouple and the other to the end that screws into the gas valve. If the thermocouple has proper continuity, a small resistance reading should be visible on the multimeter. Many multimeters also indicate continuity with an audio alert.

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.

Why does my hot water pilot keep going out?

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. Build up on your thermocouple can cause a malfunction. This is and easy fix, simply let it cool down and brush off the dirt or debris.

How much of a thermocouple should be in the flame?

about 1/2 inchThe flame should strong enough to cover about 1/2 inch at the end of the thermocouple tip. If the flame is too strong and not adjusted correctly, it will be blue and may make a hissing sound as the flame crosses the thermocouple.

Why does pilot go out?

It is positioned very close to the flame, and when lit, the pilot light tells the thermocouple to keep the gas line open. A thermocouple that is dirty or malfunctioning will often shut off your gas supply in error, causing the pilot light to go out and your furnace to stop working.

Can a thermocouple work intermittently?

Intermittent break in old thermocouple. Bending or expansion causes an open circuit. Draft condition that was corrected by the plumber (misplaced vent louvers, covers, etc.) The thermocouple measures okay, open circuit, but not under enough load to actually drive the valve.

Does Home Depot sell thermocouple?

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