Question about Bosch AquaStar 2400ES-NG

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I have a Bosch AquaStar 2400ES-NG, Error Code EA appears, I hear ignitor clicking, heater tries to activate 3 times then EA code reappears.

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  • Anonymous Mar 26, 2014

    will not fire code ea

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There are three electrodes (connected next to each other by a single piece of metal) that run up into the heat exchanger. They are situated behind the black plastic air intake in the lower half of the unit. Pull out the electrodes and clean them off with steel wool or fine sand paper. Also take the opportunity to blow the dust out of the inside of the unit and clean out the air intake.

Posted on Jun 15, 2009

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In addition to chbarone1 dont lose the fiber mesh gasket of let it break, when u put it back together and there is a gap heat will escape and cause the unit to trbl out in over heat mode and may melt and damage the comp board.

Posted on Jun 24, 2009

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1 Answer

Error code ea


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

Feb 21, 2013 | Bosch AquaStar 2400ES-NG

1 Answer

E9 error code


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

Aug 23, 2012 | Bosch AquaStar 2400ES-NG

1 Answer

E7 code what to do ?


Before calling service technician, call Bosch. 800-642-3111
E7 is not shown as common error code.
Error codes are considered start-point for troubleshooting.

Open following links for general Bosch troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Common error codes:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
Service bulletins for reading how to fix tankless yourself:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/ServiceBulletins/tabid/1300/Default.aspx

Aug 27, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Error code E9


High pitched noise is from a very high CO2 level. Adjust the gas pressure to stay above 11" w.c. and have a gas technician with a calibrated CO2 analyzer adjust the CO2 levels.

Apr 21, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

Bosch on demand tankless water heater gwh 2400 E LP error code "


BOSH AQ 250 On demand propane water heater ran out of propane, got gas now, but get EC flashing on the display and the unit won't fire? Lost manual, any suggestions. Thanks, Jim

Jan 06, 2010 | Bosch AquaStar 2400ES-NG

2 Answers

Whistling Bosch AquaStar 2400ES-NG


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

Jul 29, 2009 | Bosch AquaStar 2400ES-NG

1 Answer

Error Code EA - not in owner's manual


Think maybe just loose connect to me.

Mar 13, 2009 | Bosch AquaStar 2400ES-NG

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