Same sears 66 gallon water heater keeps resetting button after replacing both upper and lower theremostats and elements

SOURCE: I have a electric whirlpool 50 gal. energy saver

the thermostat should be replaced it only has one on the upper eloement, it has the dial on it to set the temp, but if it is only 3 months old it comes with a 1 year parts 6 year tank warranty, if you call whirlpool and tell them about this problem they will have there own teck or sub contractor that they use to come out and fix it for free,,, first go to there web site and put in your serial number and it will tell you how old the unit is, sometimes they sit for a while and are actually out of warranty before it is installed,, also did you install it your self?? if you did di you fill it with water all the way till the water came out of the hot side on your faucet full force before turning on the electric,, if not you have fried the whole unit, you will need to replace both elements and the thermostat, the elements must be completely submerged in water before they have the power turned on,,,

SOURCE: warm water only

You can eliminate the shower control knob possibility by turning on your hot water anywhere else in the house. If you get hot water in other places, then it could be the knob causing it. A substantial lime buildup in the tank can also cause poor heat transfer from the elements to the water.

SOURCE: Hello, I have a Rheem 81V52D 50 gal. residential

It's probably bad upper or lower thermostat.
BUT... new element could also be shorted.
OR ... original tank is rated 1500 watt elements look at label on side of tank.
I always replace both thermostats to save time.
Lower thermostat costs $10 at Lowes.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

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SOURCE: enough hot water for 1 bath. Replaced upper and

You have 240Volt Marathon water heater.
These heaters have element burn-out problems.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Yes sediment can cause decreased amount of hot water when water cannot circulate around lower element, and sediment can cause lower element to burn out.
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

Following list is overview of tank troubleshoot:

If you have some hot water, then that says several things:
-Upper element is working.
-Electricity from circuit breaker to upper thermostat is good.
-ECO reset button is not tripped.
-You do not have overheating event.
-Access doors and insulation are in place and thermostat not exposed to cool temperature that causes overheating.

That leaves following suspects:
1) Check if TP valve is stuck open, or pipe cracked, or faucet leaking and running hot water down a drain.

2) Upper or lower thermostat is bad.

3) Lower element is bad -and- maybe tank has built-up sediment
http://waterheatertimer.org/How-to-test-water-heater-element.html
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

4) Loose wire. Open covers and inspect. Tighten screws very tight against copper wire.

5) Bad wire between upper and lower sections of tank.

6) Do complete 30 minute troubleshoot before replacing any parts.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

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SOURCE: I have a GE hot water heater, SE40M12AA01, dual

1) You posted under Rheem-GE electric water heater.
If upper element is burned out, then water heater will not heat any water.
http://waterheatertimer.org/How-it-works.html

2) Replace upper element:
http://waterheatertimer.org/How-to-replace-water-heater-element.html

3) Open following link for complete troubleshoot:
This troubleshoot assumes you have standard thermostats and elements.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

4) Manuals and links. I do not see 'smart lights' in the manual.
http://products.geappliances.com/ApplProducts/html/GEAResults.htm#Category=Standard_Water_Heaters
Troubleshooting starts page 15.
http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=AP12168-7%20%28GE%20Elec%29.pdf

5) Add a comment with your experience so other with same-similar problem can benefit.

Also 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.