Lose of hot water at times

http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

Gene
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If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

It can be the breakers in your house or the reset button is malfunctioning

The reset button is located on the top thermostat, on the heater you will see a acess panel with screws in it to remove the thermostat and element is behind this panel. Once removed the top thermostat should have a red button to press to reset heater.
If it resets then wait for a little time for hot water. If this doesn't work then it could be the elements are in need of changing.

Hi,
No, the top thermostat will always heat first and then it should dwitch the power to the bottom one after the top of the tank heats...this is to get you hot water faster...
The top thermostat is bad and is not shutting off or switching....
Replace the top thermostat/reset combination and you''l be good!!

Check out this tip..

How to replace the Thermostat and Element for Electric Hot Water Heater

heatman101

If your water has NO hot water, then click circuit breaker

Next, click red reset button.
Turn off power.
Open cover on water heater.
If heater has 2 covers, open top cover
After re-seting water heater, insulation must be put back over thermostat to prevent cooler air from affecting thermostat.

1) Reset button is a good starting place to check water heater.
Reset clicks off for a number of reasons, including overheated water.

2) Reset will not reset, then replace thermostat.
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html

3) Resets clicks on, but clicks off again later, you should diagnose the problem.
Clicking reset is not a hazard
Click the reset as often as you want until you have time to diagnose.
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

4) Reset is not tripped, and you still do not have hot water:
Then use tester on top two screws (T1 - T3 screws -or- 1 and 3 screws) of upper thermostat to check if you have power.

If you have power, then replace thermostat.
If problems continue, a full diagnosis is needed as per the link above

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

It's time to replace your thermostat. Instead of maintaing the correct water temperature, the water is getting so hot it is acivating the safety circuit breaker. If this breaker were to fail, you could have a devastating explosion

just curious, im a plumber by the way. do you have a water softner

the limit switch may be going bad!

you probibly ran the hot water tank out of hot water shut off the hot water comming out of your fausets for a few hours and check it again u could also try to reset your tank by pulling off the front cover and hitting the reset button and my last thought is sadly you burnt out your heating elements and they need to be replaced good luck man

If you reset the water heater the first time you were without, Then odds are it is the water heater. probably an element went back. If the power off check for continuity.

Please rate this response and Good Luck, Phil