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How do you know if a heating element or thermostat needs to be replaced in an electric water heater?

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Hi you need to use a current tester to check it

Posted on Nov 18, 2009

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Posted on Jan 02, 2017

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I need the basics for replacing a thermostat on a water heater...Bradford/White brand, model M250S6DS2 50 Gal, 4500 watt per element 240 voltage 50/60 hz. It keeps over heating even at lowest setting


Copy following link for replacing thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
Suggest you might also want to test the elements while power is turned off, just in case the problem is element shorted to ground across metal tank to ground wire.
http://waterheatertimer.org/How-to-test-water-heater-element.html

At least you know the 240volt power to water heater and the circuit breaker are good.

Sep 30, 2012 | Bradford White Water Heaters

2 Answers

LOWER ELEMENT IS NOT GETTING ANY VOLTAGE ON MODEL 65220RS


Short answer: Thermostats may be bad. Replace both thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Long answer:
1) If water heater has some hot water, then upper element is good and water heater has 240Volts, and best suspect is burned out lower element.
http://waterheatertimer.org/How-to-clean-sediment-out-of-electric-water-heater.html

2) If water heater has no hot water because 240volt circuit breaker is tripped on one leg, and only 120Volts is arriving at water heater, then upper part of water heater can appear to have voltage and lower part of water heater can appear to have no voltage.
Open following links for troubleshoot steps:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/Test-electricity-to-water-heater.html

Add a comment for more help

Jun 14, 2011 | RELIANCE ELECTRIC WATER HEATER

1 Answer

My water heater wont heat up


You posted under Marathon electric heater.
If you have tankless or tank-type gas heater, information below does not apply.

Absence of hot water say upper element is not working.
1) This can be caused by tripped reset button located on upper thermostat. Open upper cover and push in reset button. Put ear against tank to hear bubbly fizzing sound. Put insulation and cover back over thermostat. Continue reading information below because reset button trips when thermostats are bad or element is shorted.
2) Upper thermostat is bad. Replace upper thermostat. I usually replace both upper and lower thermostats.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
3) Electricity going to water heater from breaker box is interrupted.
http://waterheatertimer.org/Test-electricity-to-water-heater.html
4) Upper element is bad. Test element. Replace element if needed.
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-replace-water-heater-element.html

5) Add a comment for more free help.

6) Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Jan 17, 2011 | Rheem MR105245 Marathon Electric Water...

1 Answer

The reset button has popped more then once.


You have electric water heater.
Electric water heaters are fully repairable by homeowner.

Reliance is AO Smith company
http://www.aosmith.com/OperatingUnits/Detail.aspx?id=138&ekmensel=c580fa7b_12_0_138_3
http://www.reliancewaterheaters.com/prod/elec.html

Age of Reliance water heater is shown on serial number located on side of tank:
first digit is letter. Next two digits are numbers: for example C06 means 2006.
Serial number also shows model number & wattage of elements in case you need new element from hardware store.

ECO reset button trips when upper thermostat senses temperatures higher than 150 to 180 degrees.
When ECO energy cut off trips, it turns off power at the reset button, so the tank does not continue overheating.
Tripping reset button says tank is receiving electricity, so we can eliminate that suspect.

There are 4 reasons why ECO will trip.
1) Bad upper or lower thermostat: solution replace both thermostats for about 25$. Steps shown in link below.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
2) Loose wire or shorted wire at or near upper thermostat: Open covers on water heater and inspect parts for signs of high heat and burning.
3) Bad element shorted to ground in center of element: Solution test elements and replace defective element.
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/How-to-replace-water-heater-element.html
4) Factory-installed insulation and cover has been removed from tank: thermostat exposed to cooler temperatures, and misreads tank temperature, and then elements keep heating water.

If you want to test all the parts before replacing anything:
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html


Thermostats are generic, and each functions same way and each can replace the other.
Same is true for both upper and lower thermostats
geno_3245_184.jpg

Dec 14, 2010 | RELIANCE ELECTRIC WATER HEATER

2 Answers

Rheem 83xr52-2 50 gal residential water heater. Water temp was low. I cut power at electric panel, removed upper panel on water heater, turned up thermostat, replaced panel and switched power back on at...


You can open the top up again. I would not turn the temp higher than 130 degrees, maximum. However, there should be above the thermostat a red button. This is where the power wires connect to the thermostats and heating elements. Sometimes this button needs to be reset, press it and discern if you hear a click sound. This means that the high temperature safety switch has tripped open and you had to manually "reset" it. There are two thermostats by the way. The water heater usually works this way. There are two thermostats and two heaters. The upper tank heater turns on first and it heats the top half of the tank. Then when the thermostat above is satisfied it then allows the bottom heater to come on and heat the bottom half of the tank. You might want to set the bottom heater thermostat as well. This is made this way because it is actually faster and more efficient to heat the top half first and the bottom half secondly. Try this first with the reset button. We could check voltages, but that requires a level of knowledge and safety that I am not sure that you are comfortable with. Pictures of the upper and lower thermostats and connections will help if the "reset" does not do the trick. By the way, not meaning or implying anything, but did you move the thermostat in the right direction? Sometimes the dials can be confusing.

Nov 28, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

My water is not heating in my Rheem 40 gallon electric. I pushed the reset button, but when I turn off the breaker and then on again, I do not hear the elements heating up.


Electric water heater can be repaired by homeowner
If I understand correctly, water heater is producing no hot water.
Reset button clicks in, but still no heat.

Three initial things can be causing this:
1) No power to water heater. Test across top two screws on upper thermostat for 240V. Red and black wire are attached to these screws. Screws are marked 1 and 3. Upper thermostat is same that has reset button. If power tests 120 across screws, then breaker may be off on one leg. If no power, then start testing at breaker.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) Upper thermostat is bad. Replace thermostat with generic upper thermostat available at hardware store.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) Upper element is bad. Test and replace element using Rheem 4500 watt element available at hardware store. Image shown below. Look at label on side of tank for element wattage. Rheem puts 4500 watt elements into all their 240V electric water heaters.
http://waterheatertimer.org/How-to-test-water-heater-element.html

If upper element is burned out the tank will not heat any water.
http://waterheatertimer.org/How-it-works.html

Rheem 4500Watt element
geno_3245_98.jpg

Upper thermostats are generic and interchangeable:
geno_3245_99.jpg

Nov 23, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

The red button keeps poping causing the hot water heater to shut off. I have to constantly reset it.


The red reset button or ECO or energy cut off turns off power to electric water heater.
The ECO responds to temperatures in excess of 150 degrees F.

Preliminary work:
You can use thermometer to check water temperature immediately after ECO trips.
Compare water temperature against the thermostat setting.

There are 4 things that can cause ECO to trip:
1) Bad thermostat is sticking and letting element continue heating water, or ECO is reading incorrect temperature.
2) Factory installed insulation and cover missing from tank, and thermostat is exposed to cooler air and misreads tank temperature.
3) Element shorted to ground in center of element. This completes 120V circuit to ground which will cause element to continuously heat the water.
4) Loose wire near ECO causing high-heat electrical event.

Solution:
Check for missing insulation.
Check screw terminals for signs of high heat and burning >> tighten screws.
Replace both thermostats using detailed instructions given on link below.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

If the problem continues after replacing thermostats, more troubleshooting is needed:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

For more self-help information about your electric water heater:
http://waterheatertimer.org/Do-it-yourself-water-heater-timer.html

For more help, add a comment and I will respond

Nov 04, 2010 | Water Heaters

1 Answer

Red reset button keeps kicking out, i reset button and works fine for a day or two then kicks out again


The reset button kicks out because the thermostat detects overheating.
Anything over 150 degrees, the reset kicks out.

This is caused by 4 things.
1) Bad upper or lower thermostat. Thermostat sticking in 'on' position and elements overheating water.
2) Factory-installed insulation and cover are removed
3) Bad element shorted to ground at center of element, and element continues heating with 120V through the ground wire.
4) Loose wire near upper thermostat, that is shorting and causing heat.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Solution:
Check for missing insulation.
Check for loose and burned wires.
Replace both upper and lower thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

If problems continue, test water heater elements and replace bad element.
http://waterheatertimer.org/How-to-test-water-heater-element.html

If you need more help, add a comment and I will respond.
e5788c4.jpg

Oct 29, 2010 | Reliance & 40 Gal Electric Mobile Home...

1 Answer

Electric Water Heater not heating water


Most likely it is not your thermostats. First check your circuit breakers in your electrical box. It should be a double 30 amp breaker. PLEASE USE CAUTION WHEN WORKING A ELECTRICITY! Next above your upper thermostat you will see a red reset button, push it and it should reset. It will take a little time for your water heater to heat again. If you keep having this problem it may be your elements!

Jan 31, 2009 | Water Heaters

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