Where is the reset button on the Bosch Powerstar AE125

SOURCE: no heat, no light, has flow and power?

I'm experiencing the samething it's been installed 3 years and christmas day nothing. Please help.

SOURCE: Electric bill doubled last month, and we've had the Powerstar AE125 tankless electric for over a year. There are no leaky faucets.

There are a lot of other things that eat electricity. Like space heater and using ovens for heat. Heat pump.Central heat fan running all the time. House lights left on. Outside flood lights. Clothes washer using HOT water. Look around real good. It all adds up. Also the power co. may be charging more for "fuel" costs surcharges. Here in GA I'm paying a bit more now to pay for a nuclear power plant.

SOURCE: How do I test the heating elements on Bosch Powerstar AE125 with multimeter

Product manual shows electro-mechanical thermal cutout page 9 but offers no troubleshoot steps except to say that overheating is cause.
http://waterheatertimer.org/pdf/Bosch-AE115-AE125_manual.pdf

http://www.bosch-climate.us/files/201009211859150.EP-23_Removing_and_replacing_element_assembly.pdf

Test elements:
Remove both wires off element.
Set multimeter to read ohms.
Watt and volt rating appear on side of each element.
Ohm = Volts squared divided by wattage.
For example:
Assume 240Volt circuit (240 Volts squared = 57600)
Assume 9000 watt element > check side of element for rating.
So 57600 divided by 9000 watt element = 6.4 ohms
http://waterheatertimer.org/images/ohm-reading-for-emements.jpg

Have you de-limed this unit?
Is there a check valve causing closed system in the plumbing, that might also cause decreased water flow?
Are there reduced-flow faucets or clogged aerators?
What happens when suspect cut-out element is no longer connected? The unit should continue heating.

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SOURCE: I have a Bosch Powerstar AE125 where the left

I had the same problem. I fixed it by changing out the Control Board. After that I have had no problems. I had a older model board in mine... Had a defective diode. The newer board does not have the diode on it.

Trust me it is the Control Board!