Question about Bosch AquaStar 2400ES-NG

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Have a Bosch Aquastar 2400 ES tankless water heater. Water is coming out extremely hot; error code on unit says E1. This has been going on intermittently for about 2 months. Normal fix is: powering off the unit, reset it and let it cool down. Usually runs fine for another 2 weeks then hot water and error happen again. In the past, the E1 code has been preceded by an E9 code. What's the best way to fix this for good?

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Http://www.bosch-climate.us/files/201109162006340.GWH2400ES_English_10_2007.pdf

sounds like the inlet water screen needs to be cleaned or the unit is scaled up with minerals. see attached link to manual

Posted on Apr 20, 2013

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Posted on Jan 02, 2017

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SOURCE: Bosch Pro tankless water heater overheating

The vent pipe you use is the correct size for the heater.Longer runs require bigger pipe.I also would check to see if the water is getting to hot.

Posted on Mar 16, 2009

  • 63 Answers

SOURCE: is there alot of problems with bosch aquastar 2400

Bosch has had problems with these heaters for sure. They are the best known thing out there in the market.They are mostly responsible for the bad rap being given to all tankless heaters, but a big part of the problem is installation. They are being sold to homeowners at box stores as DIY kits. These are not units to be homeowner installed, venting and fuel requirements are different from regular heaters and they will not function correctly if improperly installed. I have installed several of the Rannai units over the past few years without any issue whatsoever.

Posted on Mar 16, 2009

  • 11 Answers

SOURCE: does grundfos rcp96 pump work with bosch 2400 eo tankless heater?

What is your reason to have a recirc line on your water heater does the heater sit to far away from a certain fixture? If you put a pump on your tankless waterheater then your heater will continually fire till the call for hot water is stopped. Yes you normally do need a seperate line installed for a recirc line usually from the water heater to the farthest fixture away. If your problem is taking to long to get hot water then I suggest installing a second heater closer to problem area.

Posted on May 25, 2009

gary1121
  • 332 Answers

SOURCE: Looking for Outdoor Tankless propane water heaters

it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,

Posted on Jun 09, 2009

  • 33 Answers

SOURCE: Bosch Aquastar 2400E LP Does Not Heat Water

Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Posted on Jan 17, 2010

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Bosch aquastar wont get hot


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http://waterheatertimer.org/Crossover.html
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Before calling service technician, open following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Bosch_E1_troubleshooting.pdf
http://www.bosch-climate.us/bosch-hot-water/aquastar-service-bulletins/
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/Crossover.html

Before installing tankless water heater, read the service manuals and product manual to make sure you have testing skills and equipment needed to repair tankless gas water heater, and that you are prepared to buy expensive parts when needed and do the recommended yearly and monthly maintenance as outlined in manual.
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Fix most tankless gas water heaters yourself, same day, all brads for about $350.
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Before calling service technician, open following link for Bosch tankless troubleshooting resources, including Bosch contact information, typical manuals, error codes, tech support, parts, fuel-saver calculator, service bulletins, water heater forum, fixya links, disclaimers, and links for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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Add a comment with your experience so others with same-similar problem can benefit.

Also take advantage of fixya expert assistance live.
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Fixya is always less expensive than a service call.

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