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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

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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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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

Oct 14, 2014 | Water Heaters

1 Answer

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

Feb 02, 2011 | General Electric GE SmartWater Household...

1 Answer

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.

Feb 01, 2011 | RELIANCE ELECTRIC WATER HEATER

2 Answers

I TURNED ON POWER TO MY NEW ELECTRIC WATER 40gal MODEL # GEM402 AFTER FILLING WITH WATER. WATER WOULD NOT HEAT UP. CHECKED THREMOSTATS BOTH WERE PRSET AT 120 CHECKED POWER,BOTH HOT WIRES HAVE 124 VOLTS TO...


The controls of electric water heaters are designed so that at no time are both the top and bottom heating elements energized. Nearly all electric water heaters of this capacity in the US & Canada (other places, too) operate on 240 Volts.

When the water in the tank is below the set point of the thermostat (in your case - 120 degrees), the top heating element is expected to be on - (unless there is an issue with the top thermostat or limit switch). The top most control is the "high temperature limit". It is identified by the reset button on it. Make sure this isn't tripped by depressing the button. If it clicks - it was tripped and should start to make hot water at this point. If not tripped, you should check for the presence of 240 Volts between the heating element terminal screws. Do not measure from ground to a terminal screw and believe 120 Volts is "good". To make heat, you need 240 Volts - not 120 Volts measured across the terminals - not to ground. The amount of heat created running at 120 Volts is only 1/4 of what it will do at the correct voltage.

If you don't measure 240 Volts on the top element, check the bottom element in the same manner described for the top element.

If unable to measure 240 volts on any element, either there is a problem with the power source (blown fuse or circuit breaker), high temp limit switch, or thermostat(s).

If 240 Volts is present on either heating element, and water is not warm / hot in 30 minutes or so, a defective heating element is suspect. You can change controls without draining a tank, but replacing elements will require draining the tank first. Do not power the water heater without first filling it.

You can read a very detailed "how to" article about checking water heaters here.

I hope this helps - and good luck!

Nov 04, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

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.

Sep 17, 2010 | Rheem 81VP15S Point-of-Use Electric Water...

1 Answer

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.

Feb 14, 2010 | Rheem 30 GAL ELEC SHORT Water Heater 6YR...

3 Answers

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.

Oct 11, 2009 | Stiebel Eltron TEMPRA 24 Tankless Water...

1 Answer

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.

Apr 02, 2009 | Water Heaters

1 Answer

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.

Mar 31, 2009 | Water Heaters

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