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Cannot get the brass orifice off of the thermocoupler unit.

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  • David Shaub May 11, 2010

    If the replacement doesn't have the nut you need (Some "universal" units aren't totally universal, just cut it with a pair of wire cutters to remove it.

  • Thomas F. Schneider May 11, 2010

    Use two wrenches. Nuts are locked together. Replace the whole thing , including the brass fitting   ? 


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The thermocoupler doesnt have any removeable parts. it threads directly in the valve itself

Posted on Apr 05, 2009

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Okay you don't ream pilot injectors hence the 3 inch pilot which is now no good to you nothing to be done with that .

Take you manual to heating / plumbing shop tell them you need a new injector for you pilot block they might be able to sell you just the injector or a new pilot block Most pilot injectors are the same size . Or get you gas fitter back to replace it as the injector was only blocked and needed a clean . in 40 years of gas fitting I have never reamed a injector .

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Water heater flame going out

clogged orifice,found at the end of piloy tubeing(it looks like a tiny thimble) clear orifice with a stripped bread tie. if that doesnt do it, you need to replace the thermocouple. thats the metal sensor that your pilot flame heats. if the thermocouple is not up to temperature by way of flame ,nothing will work. these are cheap and easy to replace

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Richmond 3360 gas water heater pilot won't stay on

Open following links for pilot and troubleshooting resources:
Problem could be bad thermocouple, thermocouple not sitting in pilot flame, pilot orifice needs to be cleaned, water heater needs more air, dirty air intake, hot attic environment, backdraft blowing out pilot, or bad gas control valve.
If you get flame, then ECO is not tripped.

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My Rheemglas fury 21DV50 hot water heater pilot goes out about every 2 days for the last week and 1/2. It will light and I'll be able to have hot showers but doesn't last more than about 2 days. Is it the...

It could be a thermocouple but first take the whole pilot assembly out and disassemble it. Clean it very good (compressed air is ok) especially the orifice inside the pilot horn. You may just have a weak pilot. If the flame is in good contact with the thermocouple and problem still exist, then change the thermocouple. I believe in doing the free things first.

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Pilot light not staying lit, changed thermocouple, start up proceedure normal until the pilot button released.

Some things to check:

Make sure the thermocouple is squarely in the pilot flame and that the pilot flame is large enough to envelop the thermocouple. A weak pilot can be caused by gas pressure or a carboned-up pilot orifice (where the gas comes out). The orifice may need to be cleaned. Ordinary automotive carburetor cleaner will work. Don't try to stick objects into the orifice - damage may result. If you need to perform this step, make sure the gas is turned off to the heater first.

Make sure the other end of the thermocouple is clean and tight in the gas valve.

Hold the pilot plunger down for at least a minute to be sure to give the thermocouple enough time to heat up.

Mar 15, 2010 | Water Heaters

1 Answer

Cannot get the pilot light to stay lit

This can be two common things:

1. Carbon buildup at the pilot orifice (where the gas comes out). This can be cleaned with carburetor cleaner, but make sure the gas is off first (important!).

2. The thermocouple is either bad, displaced or it too is carboned up like the pilot assembly described above.

If you clean everything and the pilot still keeps going out, replace the thermocouple. Make sure the thermocouple is squarely in the flam path.

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Pilot goes out after heat cycle, relight and it stays burning untill next heat cyle has run.

This sounds like a dirty pilot jet orifice or a weak thermocouple. The pilot orifice can carbon up (natural gas is a fossil fuel), become weak and keep going out whenever the main burner lights, which causes a pressure drop in the gas line. The thermocouple can also become dirty and not sense properly.

The pilot light assembly should be cleaned. The gas must be turned off and it's best if the pilot assembly can be removed. Automotive carb cleaner can be used to clean the orifice. Do not try to insert any object into the pilot orifice valve as this can result in damage.

If cleaning does not resolve the problem, replace the thermocouple first. Make sure it is installed correctly and is squarely in the pilot flame.

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No gas going to my water heater

A bad/dirty thermocouple or pilot safety sensor will prevent the main gas valve from opening up and allowing gas to the main burner and will prevent the pilot from STAYING lit.

A bad thermocouple indication is the pilot will light while you are holding down on the pilot start button (thermo-couple is over ridden) but as soon as you release the button the pilot goes out.

If your description of the problem is correct and you cannot even light the pilot even while holding down the pilot light button AND you have followed all the proper relight procedures I would suspect
a dirty pilot orifice or condensation build up in the gas trap.

If you can NEVER LIGHT THE PILOT follow the steps given below: if it lights and goes out when you release the button and you have a nice blue pilot flame the problem is the thermocouple or gas valve (most likely the thermocouple).

If the pilot is yellow and weak looking and the pilot shuts off when the button is released follow the following instructions also as a weak pilot indicates a blocked/dirty orifice and will not get hot enough to activate the thermo couple and presents as a thermocouple problem.

Turn off gas and remove the cap on the bottom of the trap (little stub of pipe that hangs down below the gas line usually on a tee). Drain any condensate out, reinstall cap being sure to seal threads with dope or teflon tape. Then remove pilot tube from the heater and scrub the small pilot tubes orifice. It is very small and plugs easily with debris, rust scale etc. You may need to probe it with a tiny wire to get it clear, if so do not damage or enlarge the hole by going gorilla with it. Once you are sure orifice is clear and clean re-install, turn gas back on and attempt relight sequence, you may need to do it several times to purge air out of system. While you are at it you should also give the thermocouple a good scrubbing, steel wool or scotch brite nylon pads will do just fine for this, you just want to clear it of carbon or any corrosion.

You should get a nice blue flame on the pilot>

If you still cannot get the pilot to light AT ALL you most likely have a gas valve problem and need professional help to diagnose and fix.

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