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Thermocouple had white stuff built up on the tip

Thermocouple has white stuff built up on the end

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SOURCE: thermocouple had white soot on the end

Its not soot is cardon brush it off with a clean brush also pilot could need a clean

Posted on Dec 13, 2012

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Rayburn problems

if the pilot flame onto the thermocouple is 2 small [partialy blocked pilot feeder orifice] this will cause your described symptoms also flame 2 far from t/couple ! Tip of flame farthest from pilot burner should touch and slightly overlap tip of thermocouple

Dec 23, 2013 | Heating & Cooling


Repair your infra red heater thermocouple,do not buy one

The most common problem,for a infra red heater is the thermocouple.Not always,but if you look at the thermocouple,and it is no longer in the flame of the pilot lite,then it is the problem.The thermocouple has to be in the flame of the thermocouple,so ,to do that,you have to fabricate an extension,so that it will be in the flame of the thermocouple.I have found that a piece of tubing,such as steel brake line,works the best,use a tubing cutter,and cut a piece off the end of the steel brake line tubing.Figure out ,about how long it would have to be,to reach the flame of the pilot lite,and cut it,then just slide it over the top of the thermocouple,on the tip.The size tubing that you will need is 1/4 in .Any,and I mean any,auto parts store will have this,for about$ 2.50 or $3.00,get the shortest piece they have,most likely a foot.This tubing will heat up,therefore,transferring the heat ,to the thermocouple tip.There,you have done it,all by your self,and saved about$ 65.00.Labor,and parts.And the time involved waiting for someone to fix it.It is perfectly safe.So get to it america,fix it your self.

on Jan 13, 2010 | Heating & Cooling

1 Answer

Thermocouple had white soot on the end

Its not soot is cardon brush it off with a clean brush also pilot could need a clean

Dec 11, 2012 | Heating & Cooling

1 Answer

We have an atwood lp gas water heater 6 gallon g6a7 white rogers control. The pilot lights but when we turn it to on it goes out, even after holding it up to a minute. It was running fine, we thought we...

If pilot stay lit, then thermocouple is working.
If pilot will light, then you have gas. If pilot goes out when pilot button is released, then thermocouple is next suspect.

Thermocouple tip must sit in pilot flame.
The pilot light heat applied to two different metals inside thermocouple causes small current.
The current travels back to gas control valve through copper line.
If the gas valve receive this current, then a magnetic switch stays open and allows gas into the gas control valve.
The magnetic switch is on the end of the red button you push down when lighting pilot. Essentially the red button is an override to the magnetic switch.
If the gas control valve does not receive the current, then the magnetic switch does not stay open when you release the red button.
When replacing thermocouple, note that it is not screwed very tight into the gas control valve. Finger tight + 1/4 turn. If it is overtightened, then the small thermocouple current shorts out against the gas control body.

Sep 01, 2012 | Water Heaters

1 Answer

Believe I need to buy a Rheem Water Heater Thermocouple. Where do I find them?

If thermocouple is from ordinary tank-type water heater, then it is a generic part with different lengths 15" 17" 21" 24" 30" available at hardware of home center.
I suggest reading manual for installation information, advisories, and required maintenance.

There are good utube videos on replacing thermocouple.
Tip of thermocouple has to be positioned in the pilot flame.
The heat on tip of thermocouple causes millivolts of electric current that travel back to the gas control valve and the electrical signal causes gas control valve to keep gas flowing down the pilot tube to the pilot light.
If pilot light blows out or if pilot tube is clogged and needs to be cleaned, or if gas valve has gone bad, then tip of thermocouple cools down and electric signal back to gas control valve causes gas control valve to shut off gas going to pilot.

When attaching thermocouple to gas control valve, it is finger tightened.
Be careful and do not cross-thread thermocouple. Just use your fingers to start the nut.
Finger-tighten thermocouple and then add 1/4 turn using small wrench.
The end of thermocouple has a small piece of insulation that isolates the electric current from body of gas control valve. If thermocouple is overtightened, the insulation is crushed, and electrical current millivolts short out and no signal reaches gas control valve, so gas control valve keeps gas turned off to pilot tube.

If this is a tankless water heater, then open following link with troubleshooting resources and contact information for Rheem.

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May 20, 2011 | Rheem 36" Water Heater Thermocouple Kit

1 Answer

The bernzomatic patio heater will stay lit only if I continuously press the control knob

More than likely it is a bad thermocoupler. The thermocoupler is that pointed piece that receives the shock when pressing the ignite knob. You will have to take the unit apart to get to it. It is the pointed part with stiff wire attached that is between the shock electrode and the pilot light. It could also be the magnetic valve at the base of your control knob, but I doubt it. It could also be the tip switch which you can test with a simple continuity bulb or tester. The tip switch is wired inline between the thermocoupler and the control valve and knob assembly. It is about nickle size and has 2 wires attached to it. You can test the magnetic valve by removing it from bottom or base of the control knob and touch one end of it on a AA battery and the other end of it jumper to the opposite end of the same battery while depressing the spring at the same time. If the magnetic switch is working you will feel the magnets attract until you pull the battery or jumper wire away disrupting the connection. There is also a way to measure the resistance of the thermocouple but if you have tested the other two items you can bank that the thermocoupler is bad. Before and after make sure you don't have any leaks by using a soapy water in a spray bottle at all of the gas connections as per the owners manual.

Jan 14, 2011 | RTO Bernzomatic Brushed Nickel Patio...

1 Answer

Oven will not get to temp

Please confirm that the oven is getting the correct voltage. ( most likely 220vac across the two hots or 115 from a hot to ground ). If that turns out OK...Please check to make sure that the thermocouple is not in direct contact with a heating element. It needs to float in the space of the oven not touching anything. Hint that thermoc. looks like closed end 1/8" pipe.

hope that helps.


Sep 24, 2010 | Maytag 30" Built-In Single Electric...

1 Answer

Heater will not stay lit after releasing button

Make sure your thermocouple tip is in the pilot flame and the other end is snuggly screwed into the control. Clean the pilot if not heating thermocouple. If pilot is heating tip thermocouple and it still goes out after holding the button down for 2 minutes, then your thermocouple is likely bad.

Jan 22, 2010 | Reddy HEATER RLP30 30,000-BTU PORTABLE LP...

1 Answer

Fire will ignite showing flames but will not stay alight.

Turn off the gas. Remove the unit. Disconnect the thermocouple and pilot assembly. Clean the white powdery stuff out of the pilot assembly. Reconnect and try again.
If that does not do it you will have to replace the pilot/thermocouple assembly.

Mar 19, 2009 | Kitchen Appliances - Others

5 Answers

Flash unit wont come on

If the contacts on the battery door, or down inside the flash have green or white gunk on them, you can remove it by using the eraser on the end of a pencil. If the stuff is really stubborn, dip a cotton swab in vinegar and wipe it all over the contacts. If the stuff is white, you will see it bubble away, if it's the green stuff, let the vinegar soften it, then dry it all up with another swab. That usually does the trick.

Jun 10, 2008 | Nikon Speedlight SB-600 TTL Flash

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