Question about Rheem 36" Water Heater Thermocouple Kit

1 Answer

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

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1 Answer

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.
http://waterheatertimer.org/pdf/Rheem-Ruud-water-heater-parts-guide.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html#clean

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.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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Posted on May 20, 2011

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How to replace thermocouple in 42v50-50f


Copy following link:
http://waterheatertimer.org/How-to-replace-thermocouple.html

Rheem 42V50-50 is ordinary atmospheric-vent gas water heater with mechanical (non-electronic) gas control valve, which says that unit has ordinary thermocouple, and not thermopile.
Buy generic thermocouple from local hardware.

To replace the thermocouple you need to remove entire burner assembly from water heater, and have replacement Burner access door gasket on hand. 1-800-268-6966
Combustion door held in place with tamper-proof screws

Since the water heater problem may be more complicated than just the thermocouple, and water heater flame arresor screen may need to be cleaned, and burner parts cleaned, door gasket replaced, and gas pressure checked, and piezo electrode checked, it might be best to have qualified service technician do the work for $300.

Jul 28, 2012 | Rheem Water Heaters

1 Answer

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.
http://waterheatertimer.org/How-to-install-gas-water-heater.html#troubleshoot
http://waterheatertimer.org/How-to-test-water-heater-thermocouple.html
http://waterheatertimer.org/pdf/How-to-replace-thermocouple.pdf

Sep 25, 2011 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

I can not light the pilot on my reliance sta-kleen 502 (30 gallon) waterheater. please help


Reliance is Rheem
Replace thermocouple is best start point.
Example Whirlpool manual shows general replacement steps on page 22:
Buy thermocouple at hardware or home center. measure length before going to store.
http://waterheatertimer.org/pdf/Whirlpool-6510397.pdf

Utube videos show how to replace thermocouple

Many things can affect pilot:
Low gas pressure, Water or air or debris in the gas control valve, High-heat event causing ECO to trip requiring new gas control valve, burner and tubes needing clean-out, FV sensor tripped, loose or bad thermocouple.
Manual above shows general steps for doing some of these things, but service technician is probably best choice if thermocouple does not fix problem.

Gas water heaters require periodic maintenance.
If repairs cost more than $330, then buy new gas water heater and install yourself.
Use the old one for a solar collector.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 22, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

My reliance sta-kleen 502 gas water heaters' pilot will not lihgt. can some one give me an idea what to do.


Reliance is Rheem
Replace thermocouple is best start point.
Example Whirlpool manual shows general replacement steps on page 22:
Buy thermocouple at hardware or home center. measure length before going to store.
http://waterheatertimer.org/pdf/Whirlpool-6510397.pdf

Utube videos show how to replace thermocouple

Many things can affect pilot:
Low gas pressure, Water or air or debris in the gas control valve, High-heat event causing ECO to trip requiring new gas control valve, burner and tubes needing clean-out, FV sensor tripped, loose or bad thermocouple.
Manual above shows general steps for doing some of these things, but service technician is probably best choice if thermocouple does not fix problem.

Gas water heaters require periodic maintenance.
If repairs cost more than $330, then buy new gas water heater and install yourself.
Use the old one for a solar collector.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

May 22, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

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.

Jan 28, 2011 | Rheem 50 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

I too have an issue where our Rheem power vent water heater will not stay lit. I cannot see that it has a thermocouple though. I can only see the "glowplug" with two wires. The glow plug is fine....


You do not have thermocouple on your unit, you have a sensor. Rheem power vent water heaters ir very sensitive to any pressure changes. There are several things you can do to trouble shoot your water heater. Make sure the flue vent is fully open all the way out of the house. Unplug the unit from its electrical power source for 3 minutes, and then rest the heater. Make sure you have an adequate fuel supply, you may need to contact your local utility for a free inspection.

Dec 06, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

I have a Rheem 50 gal. natural gas water heater mod#21V50-6A followed all instruction and can't get pilot light to stay lit.


The most common reason a pilot light will not stay lit is a bad thermocouple. How old is the water heater? If the pilot light will light, but then go out when you release the safety button, that is a sure sign the thermocouple is bad. You can buy a replacement thermocouple at your local home improvement store. There is a small chance that the control valve has gone bad, but that is highly unlikely.

Feb 23, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

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