Is it expensive to replace a thermocouple?

How much does it cost to replace a furnace thermocouple?

Cost to Replace a Thermocouple on a Furnace

Replacing a thermocouple costs $150 to $250, mostly due to labor time. On older models without an ignitor, it checks to make sure your pilot light is lit. If it's not, it'll shut the gas off.

When should a thermocouple be replaced?

Replacing a thermocouple becomes necessary when the pilot light won't stay lit even after the old thermocouple has been cleaned. Choose the new thermocouple based on the size and mounting style of the old one.

What causes a thermocouple to go bad?

Changes in temperature can cause regular expansion and contraction in metal, which will cause thermocouples to weaken over time. After enough time, metal fatigue can cause a thermocouple to break. ... If thermocouples start to give out unusual readings, it may be suffering from metal fatigue.Oct 13, 2015

Can I replace a thermocouple myself?

The No. 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.

Are thermocouples universal?

Honeywell, White Rodgers, and other manufacturers make universal replacement thermocouples, usually with a 30-millivolts (mV) rating for standing-pilot furnaces. ... Electronic flame sensors are much less universal, and you must find the exact part specified for your furnace model.Aug 8, 2021

What are the symptoms of 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.4 days ago

Why is my pilot light not staying lit on my furnace?

Some common causes include issues with the thermocouple and pilot tube. The thermocouple detects the pilot light via sensors. ... A dirty pilot tube can also prevent the pilot from staying lit. If the pilot tube is dirty, let the furnace cool down and turn off the gas.Sep 9, 2019

Why does my furnace flame keep going out?

If your furnace keeps shutting off, it could be due to low airflow. There are several indirect issues that cause low airflow. Dirty Air Filters. If you don't change your air filters often enough, the filters will become dirty and clogged, which means the heat exchanger retains heat and eventually causes it to overheat.

What is the life of a thermocouple?

Thermocouple life expectancy varies greatly from just a few hours to many years. Many factors in- cluding calibration type, environ- ment, temperature, sensor design, and thermal cycling will determine life expectancy.

image-Is it expensive to replace a thermocouple?
image-Is it expensive to replace a thermocouple?

Do Thermopiles go bad?

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 long can a thermocouple last?

In 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.Mar 12, 2020


Can a thermocouple be cleaned?

Yes, you can clean a thermocouple, but the task must be done with a light touch. Remove the thermocouple from the process assembly, using a steel wool or emery cloth, lightly clean the tip removing any build up.Sep 7, 2021


Can a thermocouple work intermittently?

In electrical circuits, the most unreliable points are electrical connections. So, if in a thermocouple circuit any of the connections suffer from corrosion or lack of intimate metal-to-metal contact, intermittent operation will result.


How do you change a thermocouple?

  • Step 1: Unscrew copper lead and connection nut inside threaded connection to gas line. Under mounting bracket at thermocouple tube, unscrew bracket nut that holds tube in place. Step 2: Insert new thermocouple into hole in bracket. Be sure steel tube is up and copper lead is down.


How do you replace thermocouple on hot water heater?

  • For older-style water heaters with standing pilot lights, removing and replacing of the thermocouple is very simple: Once the pilot supply tube, burner supply tube, and thermocouple are disconnected from the gas control valve, simply lift and remove the burner assembly from the bottom of the water heater.


How to tell if a thermocouple is bad?

  • The first is signs of contamination on the tube,which can include discoloration,cracks,or pinholes.
  • Next,check the wiring for any signs of wear or corrosion like missing insulation or bare wire.
  • Finally,visually inspect the connectors for physical damage because a faulty connector can affect the reliability of the test reading.


How to repair thermocouple?

  • Measure the resistance from pin to pin on the plug. ...
  • If the resistance measurement shows an open circuit,look closely at the thermocouple itself. ...
  • There may be a broken wire in the plug if you find an open circuit from pin to pin. ...
  • If the resistance measurement shows a dead short from pin to pin,check the thermocouple itself first. ...

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