Question about Rheem Water Heaters

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We seem to have no hot water about once a week and its not from excessive usage. The reset button on the top element of our twin heating unit trips off every couple of days. I reset the push button and it heats up again. Why would this keep needing to be reset

Posted by jeff_mcleary on

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Jim Glover

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It sounds thermostat failure. It intermittently does not open or the overlimit is getting weak. replace your thermostats and this will fix your problem.

Posted on Oct 10, 2010

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MY RELIANCE WATER HEATER SHUTS OFF AND I HAVE TO KEEP PUSHING THE RESET BUTTON. HOW CAN I FIX THIS?

Why Does My Electric Water Heater Reset Button Keep Tripping? So the red reset button on your electric water heater keeps popping out and needing to be reset.
Here's the most likely problem: The water in your water heater is getting too hot.
When the water temperature in your water heater exceeds 180°, the red reset button (also known as the high-limit switch) trips. This tripping protects you from getting scalded or burned when using hot water in your home.
OK, but then what's causing the water in your water heater to get so hot? The most likely cause is a bad thermostat.
How a bad thermostat causes your water heater reset button to trip Electric water heaters have a lower and upper thermostat-one for each heating element.
The thermostats are responsible for controlling the heating elements. When the water has cooled off, the thermostats kick on the heating elements to heat the water. And once the water has reached your desired temperature, the thermostats shut off the heating element.
(This is very similar to the way your heating and air conditioning thermostat controls your home HVAC system.)
But these thermostats can go bad. When they do, they sometimes get stuck in the "on" position. This means that that the heating element continues to heat your water, eventually causing the high-limit switch to trip.
The fix: The bad thermostat needs to be replaced. A plumber can use a multimeter to test the thermostats and find out which one is bad.
Other problems that can cause your high-limit switch to trip While a bad thermostat is the most common reason your water heater's reset button may trip, it's not the only one. Other common causes include:
  • A shorted heating element-It may be that the thermostat is working just fine and shutting off the heating element. But a short in the element is causing it to continue to heat your water.
  • Loose wiring-A loose wire in the water heater can generate heat that can cause the high-limit switch to trip.
  • Bad high-limit switch-The switch itself may be malfunctioning and tripping when it shouldn't be.

Get a professional plumber's help

Do you live in the Minneapolis-St. Paul area and need a reliable plumber to help you troubleshoot your water heater problem? Contact MSP Plumbing. We can usually fix the problem the same day.
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I have a power star ae115 electric tankless water heater. It has performed flawlessly for approximately 5 years. A couple weeks ago it stopped producing HOT water but is still heating to Luke warm. The "...

5 years is about the lifespan for tankless.
You might have shorted element. That would explain cooler water and tripping reset.
Test element: power is off, disconnect wires from element; ohms = voltage squared divided by watt rating of element
http://waterheatertimer.org/How-to-test-water-heater-element.html

Call service technician./ Call Bosch
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

Gene

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

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I'm getting hot water for 2 minutes , then it gets cold

Most electric hot water heaters have two thermostats, one near the top of the tank and one near the bottom, and are covered by removable metal cover plates. The thermostats are pressed firmly against the bare metal wall of the hot water heaters tank.

The top thermostat usually has a high limit switch that will trip if the water gets too hot. When it trips it shuts off the electricity to both the upper and lower heating elements.

To reset the high limit switch there is usually a red button that you must press. When the upper limit switch trips it is often an indication that something else has gone wrong with the heater.


When the top of the tank is hot the upper thermostat removes power from the upper heating element and transfers the power to the lower thermostat and heating element. If the lower thermostat is defective, then the lower portion of the tank will not be heated and the supply will be greatly reduced.
Check for power at the upper thermostat terminals where the power is sent to the lower thermostat and heating element. If there is no power then the upper thermostat should be replaced. If there is power then check for power at the lower heating element. If there is no power at the lower heating element then replace the lower thermostat.
If there is power to the lower heating element then it should be getting hot. If it is not, replace it. Another possibility is a broken dip tube. Check for a broken dip tube and replace if necessary.

Hope this helps out

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No heat the water.

Suddenly no hot water: Red reset button tripped, circuit breaker tripped, bad upper element, bad thermostat, loose wire, TP valve is running hot water out of tank, leaking faucet is running hot water out of tank.

1) Check for leaks.
2) Check circuit breaker.
3) Open top cover on water heater and push in red reset button.
If reset is popped out and will not reset, replace thermostat:
http://waterheatertimer.org/How-to-replace-thermostat-on-electric-water-heater.html
4) Test upper element:
http://waterheatertimer.org/How-to-test-water-heater-element.html
5) Loose wire
Do full troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-water-heater.html

Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, expert speaks with you over phone while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.
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How does the reset work? I am helping a friend troubleshoot his water heater. One of the wires that connected the pig tail to the power block fried inside the water heater cover. I decided to remove the...

The reset button is set up to open the circuit if excess current is drawn by a failed Element. It works by getting hot and switching off due to current above its rating. The burnt wiring more llikely happened over a period of time because of a resistive joint in the block getting hot due to the high current that water heaters consume. It seems that the element has failed if the reset button does not get the system working.
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We have a new Rheem 30 gal short water heater. It only seems to put out about 10 gallons of hot water before it starts going cold,any suggestions......

I am assuming that everything was fine and then all of the sudden available hot water usage time dropped.

On a dual heating element hot water heater it can be

1. Internal tank loaded with sediment (drain and purge from lower garden hose fitting)

2. Thermostat or element problem with ONE of the 2 heaters. (Trouble shoot element thermostat)

3. Check Circuit breaker for partial trip of the breaker.

3helpful
3answers

Stiebel Eltron tankless 24. Problem:No hot water.Tempature display dead.Single LED on right side comes on when cold water flows thru system.Have cleaned fine mesh input filter.No pressure problems. CCt...

Take off front cover, on the top of the two cylinders in there (the heating system) there will be a small red button. That is the Safety Thermal Cut out, depress that red button. It is similar to a circuit breaker. If the red LED comes on when you turn on hot water at a sink then that was the problem. I have on that trips periodically. Its annoying but not enough to replace the part yet. Good luck.
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Top element only working

How they work. First you need to know that cold water goes into the tank near the bottom (because of the "dip tube" inside the tank) and hot water is taken out at the top. Also hot water naturally rises.
so... when the tank is full of cold water the top element will come on and heat up the top 1/3 of the water then the bottom element will come on and finish heating the rest of the tank.
so... set them both at the temperature you want the water to be... about 120^F.
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Water not getting hot

You seem to have a burned out heater elemt. Most water heaters have 2 e.ements. If the upper one bruns out, it will not heat at all. If you have a cheap heater built by State, you probably have a bad lower thermostat. It will over heat and trip the protection device. If you reset the red button on the upper thermostat and it gets too hot (check in about 2 hours) then replace the lower therm. You could still have a burned out upper element.
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