My Bosch AquaStar GWH 2400ES-NG stopped working. No display on LCD. Confirmed power. Any ideas greatly appreciated. This has been a great water heater and has provided over 15 years of service!

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David Spradling

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Bosch Master
13,399 Answers

Check voltage at unit and to display board

Posted on Aug 19, 2022

john h

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Bosch Master
28,860 Answers

Need control tested to find what failed

Posted on Aug 15, 2022

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Error code ea

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

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Oct 12, 2012 • Bosch AquaStar 2400ES-NG

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1answer

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

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Aug 14, 2011 • Bosch AquaStar 2400ES-NG

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1answer

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.

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Apr 11, 2011 • Bosch AquaStar 2400ES-NG

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1answer

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.

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Mar 26, 2011 • Bosch AquaStar 2400ES-NG

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1answer

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

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Mar 06, 2011 • Bosch AquaStar 2400ES-NG

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1answer

Roblem with the Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater... Aquastar gwh 1600 h igniter fails clicks does...

Problem could be air supply, gas supply, venting, part failure or combination of listed things.

Best place to start is manual.
http://www.boschhotwater.com/BoschModel1600H/FeaturesandSpecs/tabid/1024/Default.aspx

Typical 1600 manual shows troubleshoot starting page 19
http://www.boschhotwater.com/Portals/7/TechManuals/1600H_English_0606.pdf

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

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

Add a comment for more free help.
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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Mar 05, 2011 • Bosch 1600H-NG Natural Gas AquaStar...

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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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Feb 02, 2011 • Bosch AquaStar 2400ES-NG

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1answer

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

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Jan 06, 2010 • Bosch AquaStar 2400ES-NG

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1answer

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

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Nov 10, 2009 • Bosch AquaStar 2400ES-NG

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2answers

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

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Jul 29, 2009 • Bosch AquaStar 2400ES-NG

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My Bosch AquaStar GWH 2400ES-NG stopped working. No display on LCD. Confirmed power. Any ideas greatly appreciated. This has been a great water heater and has provided over 15 years of service!

2 Answers

David Spradling

john h

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Related Questions:

Error code ea

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. ...

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

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.

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.

Roblem with the Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater... Aquastar gwh 1600 h igniter fails clicks does...

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...

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

Bosch Aquastar 2400E LP Does Not Heat Water

Whistling Bosch AquaStar 2400ES-NG

Not finding what you are looking for?

Water Heaters

Error code ea

Open Questions:

Bosch 21e waterheater how to turn temp down

What’s a EA code on Bosch Gwh2400 CTD heater mean?

Can you help me with a Bosch aq 250sx ng?

want a manual for bosch water wizard 13b

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Related Topics:

My Bosch AquaStar GWH 2400ES-NG stopped working. No display on LCD. Confirmed power. Any ideas greatly appreciated. This has been a great water heater and has provided over 15 years of service!

2 Answers

David Spradling

john h

Add Your Answer

Attachments: Added items

Related Questions:

Error code ea

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. ...

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

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.

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.

Roblem with the Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater... Aquastar gwh 1600 h igniter fails clicks does...

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...

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

Bosch Aquastar 2400E LP Does Not Heat Water

Whistling Bosch AquaStar 2400ES-NG

Not finding what you are looking for?

Water Heaters

Error code ea

Open Questions:

Bosch 21e waterheater how to turn temp down

What’s a EA code on Bosch Gwh2400 CTD heater mean?

Can you help me with a Bosch aq 250sx ng?

want a manual for bosch water wizard 13b

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