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

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Keep getting error codes and have to reset too often

I have a Bosch GWH 715ES tankless hot water heater. While taking a shower the tank flashes an error code of A3 and E3. Of course the water immediately goes cold. Getting in and out of the shower to reset several times is not fun. Any suggestions on what the problem may be?

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  • Anonymous Jan 04, 2009

    Same problem here. Bosch hot water heater GWH 715 ES. Error code E3.

  • Anonymous Mar 28, 2014

    Water is cold occasionally

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This paticular problem your having is specific to the jumper in the heater. The jumper is for condensing heaters. Your heater does not have the specific wiring or computer for condensing. So they added a jumper in the wiring. It is failed or failing. It should ohm out at about 120ohms. sometimes its just a loose connection. Check this out, and called 1-800-642-3111, they have been very busy, but leave them a message and they will call you back.

Posted on Jan 19, 2009

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Here is the link for that particular model the you have and it has the solution for the a3 code but according to the manual the E3 code does not exist. You may have to contact Bosch for additional assistance. Thanks for using FixYa.



http://www.protankless.com/Portals/10/TechManuals/GWH715ES_English_04_2008.pdf

Posted on Dec 25, 2008

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It is a bad controller board.  You need to get them to replace it.  E3 doesn't even show up in the Technician Manuals.

Posted on Mar 07, 2009

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I had the same problem. First try to disconnet the air inlet line right and the hot water. This will draw the house air out but it might work. Manual says the inlet and exhaust can be up to 26 feet but not always the case.
In my case I had to change my exhaust pipe in the attic that had two 90's connected. Came through the sealing, 90'd toward the outside vent pipe then 90'd up and out the roof. So my total exhaust line was, 2-45's and 2-90's but I still was within the manual specs of 26 feet. I changed this to run straight out my roof which eliminated the 2-90's in the attic and now it works perfect.

Posted on Jan 14, 2009

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Pay for an answer at fixya:
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Then keep service technician number in rolodex-wallet.

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