Question about Bosch AquaStar 2400ES-NG

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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.

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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.

Posted on Mar 26, 2011

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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

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On my gwh 1600 h ng the igniter won't spark.


The igniter may not be receiving the call for heat, im not familiar with these setups, but if there is sensor or a heating element they could have gone bad.

Sep 08, 2014 | Water Heaters

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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

My gwh 2700 keeps freezing at night,and takes about 2 to 3 mins to reach a warm temp. had it for a 2 years no problem. just started with freezing. how do i fix it.


Freezing water inside pipes can damage your water heater.
you should lag the pipes and if not fitted you should fit a cover to the pipework.
Is the unit outside? if so here is a link to a manual with some info on Bosch water heaters
http://www.boschhotwater.com/Portals/7/TechManuals/PipeCover_10.2009.pdf

Mar 06, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

The water wont get even warm its just plain cold! we have tried uplugging it we have tried turning the hot water on and off to restart it as it says and non of this is working!!! we have a bosch GWH...


The gas flame igniter is not working properly.

Go to the link below and type in your model or select it and the instructions take you through the gas pressures and so on.

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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.

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