Question about Bosch AquaStar 2400ES-NG

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Have a Bosch TanklessHot Water unit Model GWH 2400 ELP. It doesn't even try to fire up. No error codes or anything. Just reads the temperature setting. Tried resetting, and unplugging etc. But no change. Also can't seem to locate a manual for this model online. Have had issues in the past with the cold water others speak of and am happy I found this site as it may help us rectify that issue.

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Posted on Jan 02, 2017

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SOURCE: Bosch tankless GWH 2400 ELP in use 2-1/2 years.

are u using well water or hooked up to city line if well water --may be to cold for unit if water is below a certain temp unit usually goes into error or shuts down if un heated space where water heater is u may have to warm [ insulate ,heat tape etc]the incoming water usually water that around 40 degrees causes problems

Posted on Feb 03, 2010

  • 8 Answers

SOURCE: error codes re: fan speed fan very noisy

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

Posted on Feb 05, 2010

  • 1 Answer

SOURCE: 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

Posted on Feb 23, 2011

SOURCE: i have a bosch gwh

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.

Posted on Apr 12, 2011

SOURCE: I have a Bosch Tankless

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

Posted on Aug 14, 2011

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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

C7 error code


C7 code has to do with your main fan. Either its not working due to it being blocked or having gotten wet/damaged/power surged, or your control unit isn't supplying the correct 120V to the fan. Your control has a ceramic fuse that you can test as well.
First, look for 120V to either the left or right pair of wires in the molex plug on the fan. if you have voltage, then the fan is bad. If you dont, its either just a fuse, the board is bad, or the fan is bad causing the fuse to blow. Insert the supplied spare fuse, and power up the unit. If it blows the fuse again, its the fan.

Mar 03, 2014 | Bosch AquaStar Indoor Natural Gas Tankless...

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

Where can i download a GWH 715 ES manual?


Are you looking for sell sheet pdf, or install-care manual, or service manual.
Search: GWH 715 ES manual .pdf
Adding .pdf to search parameter helps locate manuals.

Sell sheet with venting overview, technical and product specs:
http://www.globaltowne.com/manuals/sell_sheets/715-800SellSheetFINAL.pdf

Manual for ES high altitude, with installation, error codes and troubleshoot:
http://www.bosch-climate.us/files/201009031238250.GWH715ES_English_12.2008.pdf

I cannot find a service manual, or service bulletins:
http://www.bosch-climate.us/support-center/downloads/bosch-manuals/earlier-models.html

Aug 11, 2011 | Bosch ProTankless GWH 715 ES LP Tankless...

1 Answer

E4 code on a bosch ghw 715 control unit


Before calling service technician, open following link for Bosch troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are starting point for troubleshooting, and solutions vary by model and unit.
E4 is Backflow temperature sensor over 309 degrees F. Appliance will close burner and lock.
Check combustion air and backflow vent piping for blockage.
Check if secondary fan connections are disconnected.
Check venting specifications are met. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
Check sensor resistance

Upvote the help.
And 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.

May 29, 2011 | Bosch ProTankless GWH 715 ES LP Tankless...

1 Answer

Error codes re: fan speed fan very noisy


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

Feb 04, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

3 Answers

Bosch tankless GWH 2400 ELP in use 2-1/2 years. Whenever it is below freezing, we have problems with EC and/or EA errors, and no hot water. Sometimes restart will work. Bosch customer support is useless. I...


are u using well water or hooked up to city line if well water --may be to cold for unit if water is below a certain temp unit usually goes into error or shuts down if un heated space where water heater is u may have to warm [ insulate ,heat tape etc]the incoming water usually water that around 40 degrees causes problems

Feb 03, 2010 | Bosch & Tankless LP Hot Water Heater

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

1 Answer

Burner will not light


Try this web site!
http://www.protankless.com/BoschProHome/GasProducts/BoschGWH425HN/tabid/506/Default.aspx
Copy & Paste to Google search engine.

Jan 27, 2009 | Bosch ProTankless GWH 715 ES LP Tankless...

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