Were is my reset bottom on my stibel eltron 8-2

only getting one side of the 220 so half the heat

Direct from the maker

DHC Series Spare Parts List & Diagram - Stiebel Eltron

https://www.stiebel-eltron-usa.com > files > pdf

PDF Heating system. 165889. 167769. 167770 ... Safety thermal cut out. 162474. 162474. 162474. 162474. 162474. 162474. 162474. 162474. 162474. 9. Wiring block.
1 page

If it is under warranty, just contact the company to diagnose and fix it. The most likely cause is a failed thermostat or element, but as the flow rate is also incorrect, it may be a control board issue. This unit only seems to be available in Australia. We are in North America :>)
SERVICE-HOTLINE +49 55 31 - 70 20

DHE 18/21/24 Convenience instantaneous water heater of ...

https://www.stiebel-eltron.com > home > dhw > dhe_18...

The DHE comfort instantaneous water heater from STIEBEL ELTRON guarantees high energy efficiency. Full electronic output control with 4i technology enables ...

DHE Instantaneous 3 Phase Water Heater - STIEBEL ELTRON

https://www.stiebel-eltron.com.au > dhe-instantaneous-3...

DHE 18 AU / DHE 27 AU · Made in Germany · Precise hot water temperature up to 60°C with 4i Technology · Instant and continuous flow of hot water · Electronically ...

DHE 18 SLi 25A Convenience instantaneous water heater of ...

https://www.stiebel-eltron.in > dhe_sli_electroniccomfort

Convenience instantaneous water heater DHE 18 SLi 25A of STIEBEL ELTRON ? Product information from the manufacturer, technical data, operating ...

have u turned water back on, also some times water heater has a one way valve fitted if put back on wrong way round it wont work

hope this is what you need.
http://www.stiebel-eltron-usa.com/techdata_tempranew.html

http://www.stiebel-eltron-usa.com/pdf/install_tempra_tempraplus.pdf

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

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.

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

The thermostat that you are resetting needs to be replaced.

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.

I had the same problem with the Stiebel Eltron Tempura 24. Right side unit worked (with blinking LED), but the display and left side (including LED) did not work.

This is CRITICAL. Do not take the cover off unless you have turned off circuit breakers at the circuit breaker panel AND tested that there is no power. There is a lot of voltage/ampreage here and it could be life threatening if you get shocked. Call an electrician (or a plumber) if you don't know what you are doing.

My problem was solved by resetting the safety thermal cutout switch on top of the non working unit (red single press thermistor). See this manual http://www.stiebel-eltron-usa.com/pdf/install_tempra.pdf page 8.