Question about Bosch PowerStar AE125 AE125 Whole House Electric Tankless Water Heater...

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No hot water!!!!!

I have had the A125 electric Powerstar for a little over a year now and it has NEVER put out really hot water. Just for a couple of seconds and that is rare!!!
We have it turned up all the way.
It has always clicked when the hot water is turned on also.
Now we have NO hot water at all.
The electrician is gone that installed it and we can't seem to get anyone that is interested in coming out to fix it!!!
PLEASE HELP!!!!!!

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  • Anonymous Dec 10, 2008

    Have had the until 2 years. Had periodic problems last 6 months with water going hot then cold then hot erratically. Now no hot water at all. Certified plumber (by Bosch) came out and charged $139.00 to diagnose bad circuit board. Bosch says I have to buy a new board for $278.00. Then also have to pay plumber to change out the board $175.00. That is a total of $593 - about same price as a brand new unit!! Why doesn't the warranty cover this?? What a waste of money!

  • Anonymous Dec 16, 2008

    we had it for 6 months and worked perfectly till today... no more hot water, no light on...

  • christichesl Mar 21, 2009

    We are on our 3rd power star 125. The first cylinder clicks off and to get any hot water at all we have to go click the reset. This happens every time we use hot water. We spend more time in the garage clicking the reset than in the actual shower! In addition to that, we now have hot water for about 3 minutes, then cold for 3 minutes then luke warm.

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It is difficult to diagnose tankless water heaters remotely since there are so many variables to take into account. It might be helpful to check the troubleshooting information on your model at boschhotwater to see if a handy solution is available before calling out a service tech. There are PDF's viewable with more detailed information on troubleshooting (flow rate, power supply, inlet temp, graphics, etc.) and they have a tech support phone # which is very helpful.
If the light is on and you still don't have hot water, I would start by checking the thermal cutouts (breakers) on top of each heating module that could be tripped and need reset.

I can attempt to post walk-through if needed.

Posted on Dec 11, 2008

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