Question about Stiebel Eltron TEMPRA 12 Tankless Water Heater

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Tempra 12 tankless water heater keeps tripping the thermal cut off if I hold cut off down it stays on

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Posted on Jan 02, 2017

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garypetterss
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SOURCE: how can I reset the safety thermal cut out from my

the diagram on this page shows the safety thermal cut-off on top of the heating vessel on the right, inside the unit, remember to electrically isolate before opening.http://www.tanklesswaterheaters.com/tempra12.html

Posted on Apr 11, 2010

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  • 6 Answers

SOURCE: My Tempra, 29 Plus quit

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.

Posted on Dec 06, 2011

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1 Answer

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...

1 Answer

Keeps tripping thermal shutdown


Most of the time its just bad (thermo disk) thermal shutdown as you call it. If you dont have any hot water at all just unplug the two wires on that disck and stick them together,this bypass that disk. then have somebody turn on the hot water while you watch the heater for any problems. Let me back up just a little.
Before you do that you must know if its tripping while the water is flowing through the heater if it is then its a weak disk. If it trips a few seconds after the water is shut off then for some reason(usually a bad circuit board) the element is not shutting off and over heating the disk. That means the disk is doing its intended job. Do not bypass the disk ifit trips after the hot water is shut off at a faucet.

Jan 11, 2013 | Stiebel Eltron TEMPRA 12 Tankless Water...

1 Answer

High temperature thermal cut-out has tripped


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.

Jan 04, 2013 | 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...

2 Answers

My Tempra, 29 Plus quit heating. I checked the breakers and they are ON. Where is the thermal cut-out located ? How is it reset? What temperatue should I set on the dial?


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.

Feb 07, 2011 | Stiebel Eltron TEMPRA 24 Tankless Water...

1 Answer

The internal circut breaker snaps off soon after water starts to pass though. Why would that happen?


This is common problem with tank-less electric water heaters. There a a couple of things you can do. Turn the temperature down on the thermostat, this will lower the power requirement. The other thing you can do is replace the safety thermal cut-off switch. If you have two or three replace then all at the same time. Thermal safety switches are manufactured by the hundreds of thousands and go bad quit often. Contact the manufacture for free replacement parts.

Dec 16, 2010 | Stiebel Eltron TEMPRA 24 Tankless Water...

1 Answer

How can I reset the thermal cut off


Take off front cover, on the top of the cylinder(s) 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.

Dec 05, 2010 | Stiebel Eltron TEMPRA 12 Tankless Water...

1 Answer

How can I reset the safety thermal cut out from my tempra 12


the diagram on this page shows the safety thermal cut-off on top of the heating vessel on the right, inside the unit, remember to electrically isolate before opening.http://www.tanklesswaterheaters.com/tempra12.html

Apr 11, 2010 | Stiebel Eltron TEMPRA 12 Tankless Water...

2 Answers

Where do I find the reset button on the Stiebel Eltron Tempra 15?


On the Tempra 29 there is a "safety thermal cut-out" on the top of each of the heating elements within the box. I have had to open it up before to push the breaker. They are a small red plastic push button on the top. Carefully press the braker button without touching the electrical wiring inside. I hope that works for you.

Sep 15, 2009 | Stiebel Eltron TEMPRA 24 Tankless Water...

2 Answers

No hot water in our tankless water heater


You may find this info helpful.
http://www.stiebel-eltron-usa.com/pdf/install_tempra.pdf

If you don't find what you need, you will need to contact them directly.

Apr 05, 2009 | Stiebel Eltron TEMPRA 12 Tankless Water...

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