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High temperature thermal cut-out has tripped

The themal cut out keeps tripping perodicly, resets for a week or two and then trips again

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  • Water Heaters Master
  • 5,089 Answers

Type, model, brand, age of water heater, and general installation of water heater are unknown.

1) Electric tank-type water heater: replace thermostats and test elements.
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

2) Gas tank-type: replace gas control valve, clean air intake screen/ location varies by brand:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

3) Tankless: call service technician, or replace tankless with tank-type and save money long-term.

4) Add comment and describe water heater using label located on side of unit, and include what you are doing to 'reset' the thermal cut-out.

Posted on Jan 05, 2013

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6 Suggested Answers

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Posted on Jan 02, 2017

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  • 234 Answers

SOURCE: Water heater trip circuit breaker

I would say you have a bad element in the bottom.If the water is cold and heat until the top thermostat reach it tempture,then switch the bottom element and then the breaker trip.So replace the bottom element.

Posted on Mar 15, 2009

  • 3600 Answers

SOURCE: I have a Rheem Warrior Class Model 72-52-2 240/208

Yes it is most likely shorted out to test remove the wires after you have disconneted the breaker turn off the water and drain water then remove it and replace it.

Posted on Sep 30, 2009

SOURCE: The reset thermal cut-off keeps tripping

I am a free answerer, and I specialize in giving you resources for free
The paid answerers may have a person who knows your product and the problems associated with your model.
I believe they offer a refund if the 'fix' doesn't work.
The manual might also have troubleshooting.

Each day I see 20-25 unanswered questions about tankless water heaters.
And the day before, there were same number of unanswered questions about tankless products.
The number of questions shows the complexity of the machines, the brand-specific-ness of the problems, and the inability of the manufactures to take care of their customers.
If I understand correctly, the manufacturer will refer you to the installer.
There are not many ways a do-it-yourself-er can fix a tankless.
And a repair generally takes somebody trained by the manufacturer.


http://www.thetankatwaterheaterrescue.com/forums/forum3/

Posted on Nov 03, 2010

  • 302 Answers

SOURCE: My electric water heater keeps tripping the high

the element is shorted out causing this issue.
I have had that happen to me before.
or there is a water leak dripping down on it and causing it to trip the reset switch.

Posted on Nov 14, 2010

Dplumber
  • 119 Answers

SOURCE: MY HEATER IS DCH-E10...... EVER SINCE I PUT IT IN

You need to replace the high-limit reset switch on your Stieble Eltron DHC 10-2 Electric Tankless Water Heater.

Posted on Dec 14, 2010

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1 Answer

Reset button on a o smith keeps tripping


After the high limit trips once, it is no longer calibrated. Replace the upper stat and limit.

Mar 21, 2017 | Water Heaters

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The thermal breaker keeps blowing


Replace the limit, by tripping often they become even more likely to nuisance trip.

Apr 29, 2016 | Stiebel Eltron TEMPRA 24 Tankless Water...

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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

Bosch AE-9.5 keeps tripping the reset


All resets and breakers trip with high heat.
Do you mean the tankless unit is tripping the 40 amp circuit breaker?
Or the thermal cut-out, located on unit, is tripping?

Is this a new installation?
Or was the tankless working before and stop working?

Copy following link to check wiring.
AE 9.5 requires 40 amp breaker and 6 gauge wire.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

If the unit is tripping the thermal cut, -out, then product manual says to call Bosch or service technician.
Call Bosch 866-330-2729
http://waterheatertimer.org/pdf/Bosch-Powerstar-AE3.4-7.2-9.5.pdf
Thermal cut-out can trip if water flow is too low.
Try changing power selector screw from Hi to Lo so only 1 element is ON. See diagram page 6 of manual.
Adjust the 'outlet service valve:' The manual recommends that a ball valve be installed between hot outlet and faucet. Adjust the valve so more water flows to faucet.
Remove aerator, clean aerator, don't use low flow restrictions or low flow shower heads, replace leaky faucet cartridge on single-handle faucet.

Aug 29, 2012 | Bosch AE-9.5 PowerStar 1.5 GPM...

1 Answer

I have norton tankless water heater, and the reset keeps getting tripped... what can cause this?


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

Aug 23, 2012 | Water Heaters

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

1 Answer

My electric water heater keeps tripping the high temp cut off switch every day. I've replaced the thermostat and the problem still occurrs.


the element is shorted out causing this issue.
I have had that happen to me before.
or there is a water leak dripping down on it and causing it to trip the reset switch.

Nov 14, 2010 | RELIANCE ELECTRIC WATER HEATER

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

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