Bosch AquaStar 2400ES-NG - Answered Questions & Fixed issues


Bosch 1-866-642-3198; 800-642-3111
Copy following links to narrow down cause for EA error code:
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Aqua star service bulletins
http://www.bosch-climate.us/bosch-hot-water/aquastar-service-bulletins/

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bosch AquaStar... | Answered on Mar 23, 2018 | 525 views


This should run two showers at once with no problem. If you have a shut off valve on the cold side of the heater, try closing about halfway. This will slow the water flow and the water will have more time to heat up as it pases through the tank. If you dont have a shut off valve, just cut back the hot water valve on your shower and do not use any cold water. If it gets too hot then turn on a little cold water. The object is to slow the speed of the water going through the tank. Tankless heater take a little getting use to but they work great when you know how to treat them. On my shower I turn the hot all the way on until it gets hot and then add a little cold water to bring the temp down. You may have too much water going through too fast to be able to heat it up to what you need. Try this and see how it works.

Bosch AquaStar... | Answered on Dec 18, 2017 | 342 views


if you have incorrect gas line size when it kicks on the lack of gas pressure to the unit will cause a wistling. make sure you have enough gas to the unit

Bosch AquaStar... | Answered on May 16, 2016 | 647 views


Hi,
The unit is plugged up with mineral buildup from the water going through it... it will need to be cleaned internally....this is done by running an acid solution through it to clean out the mineral buildup...

Then it will work again...

heatman101

Bosch AquaStar... | Answered on Dec 16, 2014 | 531 views


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Bosch AquaStar... | Answered on May 06, 2014 | 119 views


E2 is a cold water inlet temp sensor. Has your unit experienced any freezing conditions? If it senses below 36 degrees or above 90 degrees it will show this error.

If its normal temp, and you still get this error...check your sensor. Its an 8(kohm) sensor. Make sure its not open. If it reads ok and your temp is not an issue, then you probably have a bad control board

Bosch AquaStar... | Answered on May 06, 2014 | 151 views


C7 is displayed when the primary fan (the one in the middle just under the copper heat exchanger) does not spin or the computer does not recognize that it is spinning. There is a plug on the back of the fan. Make sure it is plugged in all the way.
This also happens when the computer gets damaged because the unit is plugged in to an extension cord, power surge or poorly adjusted combustion (most contractors lack the proper equipment to adjust the flame on high efficiency equipment). I have been to over 500 tankless water heater installations and found every one of them were not adjusted at all! It can also be a damaged fan caused by an improperly installed exhaust pipe.

Bosch AquaStar... | Answered on Oct 17, 2013 | 100 views


Clean out pilot jet probably dirt blocked it John then try again

Bosch AquaStar... | Answered on Oct 12, 2013 | 49 views


possibly needs descaling and or pump needs replacing

Bosch AquaStar... | Answered on Oct 12, 2013 | 78 views


you must read your owner manual read the troubleshooting section, and if the problem persist, get the website with your supplier and connect via ONLINE chat with technical personal in order to Help you and fix it.
God bless you

Bosch AquaStar... | Answered on Oct 12, 2013 | 114 views


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

Bosch AquaStar... | Answered on Apr 20, 2013 | 509 views


Check for crossover.
Bad single-handle faucet cartridge causes cold water to enter hot pipe, so hot never arrives and tankless does not run consistAntly
http://waterheatertimer.org/Crossover.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bosch AquaStar... | Answered on Dec 01, 2015 | 330 views


On this unit it requires cleaning of water inlet valve every 3 to 5 years and it may need a kit woth new o rings.

Bosch AquaStar... | Answered on Feb 25, 2013 | 56 views


1) Live answer Feb 2013:
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf

2) Call Bosch
1-866-642-3198

3) Call service technician.

4) Fix any brand tankless water heater problem yourself, same day, for $350
http://waterheatertimer.org/How-to-install-gas-water-heater.html

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bosch AquaStar... | Answered on Feb 21, 2013 | 125 views


the A3 & E3 codes are for the back flow sensor on the heater. Could be disconnected or a bad sensor. Call bosch tech support and they will help you with this.

Bosch AquaStar... | Answered on Oct 30, 2014 | 2,895 views


Before calling service technician, copy following links for troubleshoot resources:
http://waterheatertimer.org/pdf/Bosch_E9_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
You should delime water heater once per year to prevent many common error codes.
http://waterheatertimer.org/pdf/Delime-tankless-water-heater.pdf

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bosch AquaStar... | Answered on Aug 24, 2012 | 594 views


Code EL does not show on typical Bosch error code list.
Maybe you have E1 ??
Or Bosch has some other error codes not listed.
http://waterheatertimer.org/pdf/Bosch_E1_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.bosch-climate.us/support-center/technical-support/

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bosch AquaStar... | Answered on Aug 21, 2012 | 687 views


Does it happen to any other fixture? If not, it's most likely your shower valve and not heater.

Bosch AquaStar... | Answered on Jul 25, 2012 | 1,117 views


it must not be on properly or not tightened properly

Bosch AquaStar... | Answered on Jan 20, 2012 | 28 views

Not finding what you are looking for?
Bosch AquaStar 2400ES-NG  Logo

100 questions posted

Ask a Question

Usually answered in minutes!

Top Bosch Water Heaters Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22485 Answers

john h

Level 3 Expert

22486 Answers

jdthefixer

Level 3 Expert

746 Answers

Are you a Bosch Water Heater Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...