Follow this steps and fix it. God bless you
If there is no hot water, first push the reset button on the high-temperature cutoff; test the thermostat and replace if faulty (see below). Test the heating elements and replace if faulty (see below).
If there is not enough hot water, adjust the thermostat settings. As
needed, reset, test and replace thermostats and heating elements if
faulty.
If the water is too hot, adjust the thermostat settings and reset. Test and replace the thermostat or high-limit cutoff (see below).
An electric water heater is a 240-volt appliance that can deliver a fatal shock. Always turn off power to the heater at the electrical panel 
before
beginning work, and verify that power has been shut off. Make sure
others in the house know not to restore electricity prematurely. If you
have any doubt as to whether electricity has been turned off, seek
professional assistance.
SOURCE: Stiebel Mini 4 won?t activate using 40l/min pump
You have to make sure that the pump is flowing enough water to activate the Stiebel. The tankless unit has a activation rate of a certain amount of water to turn it on.
SOURCE: Where do I find the reset button on the Stiebel
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.
SOURCE: tempra 12 the when you
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 only see the questions where people have not paid.
Each day I see 20-25 unanswered questions about tankless water heaters.
And the day before, the same number of unanswered questions about tankless products.
The number of questions shows the complexity of the machines, and the inability of the manufactures to take care of their customers.
The manufacturer will refer you to the installer.
http://www.thetankatwaterheaterrescue.com/forums/forum3/
There are not many ways a do-it-yourselfer can fix a tankless.
In contrast with tankless, tank-type water heaters have generic
troubleshoot steps that lead to a quick diagnosis, and same-day repair
of almost any brand. Most times a tank-type heater repair can be DIY.
SOURCE: The water heater "Stiebel Eltron
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/
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