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Connecting the thermocouple - Grilling

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  • Master
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You listed your question under problems with grills and smokers. What type (brand) grill do you have?
Thanks.

Posted on Apr 07, 2011

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Posted on Jan 02, 2017

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I have 3 charmglow heaters. I can get the pilots to light but when I try to turn the knobs to high or low they go out. Doesn't seem like gas is coming out at that point. Why?


there should be a thermocouple protruding into your pilot flame. This device, when hot, produces an electrical voltage that tells the gas valve that it is safe to turn on the gas. The thermocouple can be bad or frequently the small tube or wire connection from the thermocouple to the gas valve gets corroded and doesn't make connection. Try cleaning this connection first. It may be just screw terminal connections or a hexnut. loosen the screws or hexnut and clean ... reconnect and test. If it does not, pick up and install a new thermocouple.

Feb 05, 2015 | Brinkmann Charmglow Stainless Steel LP...

1 Answer

Fused Terminal Block on Refrigerator


  1. Signal Integrity
    • One benefit of using a terminal strip to connect the thermocouple wires is signal integrity. Since the thermocouple has a temperature probe located on the end of the wires, a signal must be sent from the probe to the thermocouple. The equipment and machinery will work intermittently, if the signal strength is not maintained. For example, if the probe senses the flame on the furnace, it sends a signal to the thermocouple. Once the flame goes out, a signal is sent to the thermocouple, which shuts off the gas.
    Shield
    • The terminal strips have a covering, or shield, to protect the thermocouple wires. You can open the strip and gain access to two metals for testing. You must cut off the insulation surrounding each metal wire and insert them into a terminal strip to make the proper connection. The cover protects those bare wires from dirt and debris. The cover can be removed when troubleshooting the thermocouple and wiring. Without the terminal strip, you would have to cut off each wire's insulation to test the signal strength and voltage between the probe and the thermocouple.
  2. Transmitter
    • A thermocouple sensor that has to carry signals over a long distance requires a thermocouple transmitter to strengthen the signal. Using terminal strips makes it easier to connect a transmitter to the thermocouple device. The terminal strips also lengthen the thermocouple wires. If you need to extend the distance from the probe to the thermocouple, you can add additional wires and splice them with terminal strips to increase the distance. It is like adding an extension cord to an outlet, so you can extend the distance between the outlet and the television.
    Connection
    • Another benefit of using a terminal strip is that the strip enables a better electrical connection between the two thermocouple wires. Without a terminal strip, you would have to introduce signal compensation metals for the thermocouple sensor to get an accurate temperature reading between the two metals. Since the terminal strip uses the same metals found in the thermocouple wires, your electrical connection will not lose voltage. A decrease in voltage can trip the thermocouple.

Jan 09, 2013 | Dryers

1 Answer

We replace the thermocouple and cant get the pilot t stay lte.its on a 40 gal hot water heater


Sometimes, when DIYers install a new thermocouple they over tighten it. The correct way to install a thermocouple is to finger tighten the connection into the gas control valve and then, with appropriately sized open in wrench, tighten it only 1/4 turn more. Over tightening it, can cause the control valve to lockup. Also, check the positioning of the thermocouple. The pilot flame should engulf the tip of the thermocouple. If it doesn't reposition the thermocouple and clean the pilot. Especially clean it, if the pilot flame is curling upward, instead of being straight out.

Hope this helped you troubleshoot and solve the problem.

Apr 20, 2011 | Heating & Cooling

1 Answer

I have a desa fireplace model CGCFTP 26K btu, THE PILOT WILL NOT STAY LIT, I believe that it is the thermocouple, would you confirm or deny


Many times this problem is because the thermocouple has developed a bad seating connection between the thermocouple fixing nut and the Thermo-Electric valve located inside of your actual control valve assembly.

Meaning the connection between the end of the thermocouple wire just above the thermocouple fixing nut and the seat which is inside the Thermo-Electric valve have a bad connection that does now allows current to pass through the connection and into the Thermo-Electric valve.

When you have a good connection here it allows the control valve to stay open and allows gas to pass through the control valve into both the pilot and the main burner, but if this connection is bad then each time you release the button the pilot light will goes out.

Now to try and resolve this service problem with having to purchase new and sometimes expensive parts.

Remove the thermocouple wire from the gas control valve Thermo-Electric unit by turning fitting counter clockwise with a 5/16 wrench

Once the thermocouple fitting has been loosened and the thermocouple has been removed inspect the thermocouple Power Unit Connector Contact (PUCC).

Although the PUCC may appear clean may times the PUCC has developed a thin layer of corrosion that prevents the thermocouple from sending the needed current to the Thermo-Electric unit resulting in a pilot flame that may only remain burning strong as long as the pilot button is being pushed by the operator.

After removing the thermocouple PUCC from the valve you will need to clean both the power unit connector contact and the Thermo-Electric valve seat contact.

The connecting will require that a small amount of new "Clean Metal" be exposed providing a new fresh metal seat for the PUCC and the Thermo-Electric valve.

With a safety blade or a metal pick expose some new metal on both the PUCC and then up inside the Thermal-Electric valve seat scraping just a small amount of old surface from each item.
Now reassemble the thermocouple wire back into your gas control valve and tighten the nut firmly to achieve a good solid seating connection.

This new fresh metal seat should allow the millivolt current generated from the thermocouple to energize the Thermo-Electric valve and allow the gas control valve to remain in the open position.

If this does not work you may need to order a ned Pilot/ODS assembly.

You can find that at www.msservice.net or www.allpartsinc.com

Thank you:

Nov 05, 2010 | Desa International CGCFTP Compact Heater

1 Answer

My All-Pro 85,000 btu heater will not stay running after I let go of the fuel /start button. Is this the result of a faultly thermocouple?


Yes this is probably the thermocouple connection.

Just remove the end of the thermocouple from where is goes into the gas valve and leave the end that goes into the flame in place.

Clean the end of the thermocouple connect by scraping off just a little metal from the end just about there the nut tightens the thermocouple into the gas valve. After you have exposed some new metal do the same inside the valve where the thermocouple seats into the gas valve.
Use a small pic or similar item to scrape inside the gas valve to expose some new metal there also.

Now reassemble the thermocouple into the gas valve and see if the heater works.

Here is a link with some more instructions.
http://www.msservice.net/ts/reseat_thermo-clean_pilot-ODS.htm


Thanks

Oct 10, 2010 | All-Pro SPC-85 Utility Heater

1 Answer

My Master propane heater will not stay lit. It only burns when I hold the pilot button in. Is it the thermocouple?


Yes this is probably the thermocouple connection.

Just remove the end of the thermocouple from where is goes into the gas valve and leave the end that goes into the flame in place.

Clean the end of the thermocouple connect by scraping off just a little metal from the end just about there the nut tightens the thermocouple into the gas valve. After you have exposed some new metal do the same inside the valve where the thermocouple seats into the gas valve.
Use a small pic or similar item to scrape inside the gas valve to expose some new metal there also.

Now reassemble the thermocouple into the gas valve and see if the heater works.

Here is a link with some more instructions.
http://www.msservice.net/ts/reseat_thermo-clean_pilot-ODS.htm


Thanks

Oct 10, 2010 | Master Heaters BLP375AT

1 Answer

How to fix F7 in turbochef


F7: Thermocouple Open

CC Thermocouple

Reads 999?F/C or

IR Thermocouple
Reads 1999?F/C



1. Check the connection of open thermocouple on the I/O control board.

If the connection is OK, verify thermocouple is not an open circuit

by using your ohm meter. The cook cavity thermocouple should

measure approximately 4-5 ohms and the IR thermocouple should

measure approximately 30-40 ohms. Measure at the I/O control board

40-pin connector.

o Thermocouple indicates open circuit: Replace defective thermocouple.
o Thermocouple OK: Replace the I/O control board.

Oct 04, 2010 | TurboChef TORNADO Electric Oven

2 Answers

What component inline with thermocouple on assy 9003542:


The thermocouple connects directly to the gas valve. They're universal fit.

Oct 22, 2009 | Reliance Water Heater #9003531 NAT Gas...

1 Answer

The pilot light on my gas water heater continually goes out. I can re-light the pilot and get it going. The gas burners goes on runs for awhile. I'm assuming when that when the temp hits the desired temp...


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The pilot assembly should look similar to the pic above. Depending on where you live, you may be required to hire a certified plumber to replace the parts. If not you can do it your self. Keep in mind if it's not staying lit you also need to check the thermostat and the thermocoupler before replacing the pilot assembly. There is a good chance it is just the thermocoupler going out. It is one of the first things to check when troubleshooting a pilot light problem with a gas water heater. A thermocouple determines if the pilot light is lit. If it's not lit, the gas valve fails. If that's the problem, replace the thermocouple.


  1. Shut off the gas valve on the water heater and the gas valve on the line near the heater. Remove outer and inner doors, and loosen the pilot and supply tubes and the thermocouple connections to remove the burner assembly.
  2. Step 2 Loosen the screw holding the thermocouple to the bracket. Remove old thermocouple. Bring it with you to the store to ensure you are buying the proper replacement.
  3. Step 3 Install the new thermocouple. Position the thermocouple so that the pilot flame heats 1/2 inch of the tip.
  4. Step 4 Reinstall burner assembly in the water heater. Tighten burner supply tube, pilot tube and thermocouple connections. Tighten thermocouple no more than a quarter turn more than hand-tight.
  5. Step 5 Turn on both gas valves. Check supply tube and pilot tube for leaks with soapy water. If soap bubbles, tighten connections to fix leak. Ignite the pilot light, and make sure the thermocouple tip is heating up. Replace inner and outer doors.

Jul 09, 2009 | Northern Tool Water Heaters

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