Question about Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch GWH 2400 CTD EFS NG tankless water heater. It has been installed on operating for over a year in the last several days it has an error code A3. The first two times I was able to reset it. Now after clearing the fault,the fan starts running w/o burner ignition for about 3 seconds then stops with fault A3.The manual says to check the jumper cables at the top right of the combustion section. They are securely attached. Help! Bill

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1 Answer

Call qualified service technician, and ask that person questions about maintenance and tips.
Then keep service technician number in rolodex-wallet.

Resourceful do-it-yourselfer will find following links handy.
Tankless are maintenance heavy, and Bosch and Rheem etc say to call service technician for recurring problems. Especially when short-hand troubleshoot section doesn't solve problem.
People spend years learning how to service tankless.

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

BOSCH error codes online:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Bosch manuals:
http://www.boschhotwater.com/HelpfulResources/BrochuresManuals/tabid/354/Default.aspx

Bosch problems at Fixya:
Open following links and read about tankless problems to understand the field and glean useful information.
http://www.fixya.com/support/p949576-bosch_1600h_lp_liquid_propane_aquastar_a/solutions

Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Post question on pro water heater forum: This is where I go to catch up on latest info in always-evolving water heater industry.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Pay for an answer at fixya:
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Mar 18, 2011

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Posted on Jan 02, 2017

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SOURCE: I have a Bosch GWH

Call qualified service technician, and ask that person questions about maintenance and tips.
Then keep service technician number in rolodex-wallet.

Resourceful do-it-yourselfer will find following links handy.
Tankless are maintenance heavy, and Bosch and Rheem etc say to call service technician for recurring problems. Especially when short-hand troubleshoot section doesn't solve problem.
People spend years learning how to service tankless.

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

BOSCH error codes online:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Bosch manuals:
http://www.boschhotwater.com/HelpfulResources/BrochuresManuals/tabid/354/Default.aspx

Bosch problems at Fixya:
Open following links and read about tankless problems to understand the field and glean useful information.
http://www.fixya.com/support/p949576-bosch_1600h_lp_liquid_propane_aquastar_a/solutions

Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Post question on pro water heater forum: This is where I go to catch up on latest info in always-evolving water heater industry.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Pay for an answer at fixya:
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on Mar 18, 2011

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http://www.ps2netdrivers.net/parts/bosch.gwh.425.hn/

Nov 10, 2014 | Bosch & Tankless LP Hot Water Heater

1 Answer

How do i gas heater gwh 2400 ctd efs Lp


Stupid me but could you be a little bit literate in asking a question.

My dog write better questions that I can understand than this scribbling.

A GWH 2400 is the little brother of the GWH 2700 much like the 635ES. If you have an LP model be sure to use the overpressure protection valve supplied by Bosch as overpressure in LP (above 10-14" WC) can completely destroy this unit.

And you can use a TPR or PRV for 170,000+BTU being sure you get a House Pressure valve of 60-80-100 PSI+ and not the boiler PRV for 30 PSI

Beyond that your questions above states nothing recognizable as a technical question

Oct 19, 2014 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch Tankless Water HEater Model GWH 2700 ES NG with an error code of A3. I was told to push reset and the problem would be resolved. This worked several times and now it doesn't work. ...


Yes. Contact Bosch.
Error codes are considered start-point for troubleshoot.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Tankless are complex electronic machines.
If on-site plumbers cannot figure out problem, then you need trained service technician with a service manual for your specific product, who can ohm-test the electronics.
Bosch will have a list of trained service technicians. And maybe Bosch has another step for fixing problem yourself.

Fix most tankless problems yourself, same day, for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Aug 14, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

I have a bosch gwh 2400 es ng and when i program the temp. it resets back to 100 degrees


Before calling service technician, open following link to download typical manual, get Bosch contact information etc.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Apr 11, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

I have a Bosch GWH 2700 CTDR EFS NG and the water will not get hot and if it does, it's only for a brief moment.


A lot of factors, internal and external, can cause this problem ranging from bad PC board to plumbing problem.

Since you have no error code, it could be plumbing,
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Open following link for useful Bosch troubleshooting information including Bosch support and typical manual for 2700 gas tankless:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

For folks with Rheem tankless:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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

Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 26, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

I have a Bosch GWH 2400 CTD EFS NG tankless water heater. It has been installed on operating for over a year in the last several days it has an error code A3. The first two times I was able to reset it....


Call qualified service technician, and ask that person questions about maintenance and tips.
Then keep service technician number in rolodex-wallet.

Resourceful do-it-yourselfer will find following links handy.
Tankless are maintenance heavy, and Bosch and Rheem etc say to call service technician for recurring problems. Especially when short-hand troubleshoot section doesn't solve problem.
People spend years learning how to service tankless.

Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

BOSCH error codes online:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Bosch manuals:
http://www.boschhotwater.com/HelpfulResources/BrochuresManuals/tabid/354/Default.aspx

Bosch problems at Fixya:
Open following links and read about tankless problems to understand the field and glean useful information.
http://www.fixya.com/support/p949576-bosch_1600h_lp_liquid_propane_aquastar_a/solutions

Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Post question on pro water heater forum: This is where I go to catch up on latest info in always-evolving water heater industry.
http://www.thetankatwaterheaterrescue.com/forums/forum3/

Pay for an answer at fixya:
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

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1 Answer

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I was looking for a service manual, which you apparently do not supply. I was not looking for someone who will charge me a fee to get information. I can get that info directly from Bosch for free. Thank you for answering. John

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