Bosch Tankless GWH 715 Powers on but does not ignite. Reset does not do anything. Diagnostics not working i.e., water flow 00 but water flowing. May be faulty control unit but how do I confirm?

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David Spradling

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Bosch Master
13,400 Answers

Possible bad flow switch

Posted on Jan 10, 2021

Jack DeFender

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WOW!!!
Great answer by Steve (I know Steve Spam...real name Richard). Lot of time on his hands (37000 answers).

Can we get real professionals answering questions.

Thank you Richard...let's just call you Dick for short.

Posted on Jan 09, 2021

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Bosch Master
38,673 Answers

Most people consult a professional

Posted on Jan 09, 2021

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My GWH 715 ES cannot restart after hot into cold water crossover

Check for obstruction in your watervalve. It has a flow meter, that needs to spin freely. Remove the watervalve and blow through it, you should hear it spin.
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Where can I download a Boschw14 b31 gas Heater Manual

Is this a water heater? Bosch site might have manual. And service bulletins, but I have not heard of that model.
http://www.bosch-climate.us/Bosch-Hot-Water/
Call local service technician who is qualified to work on tankless computer that heats water.
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Aug 05, 2013 • Bosch ProTankless GWH 715 ES LP Tankless...

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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

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

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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.

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

1helpful

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What does Error code A3 mean and how to correct it ?

http://www.bosch-climate.us/files/201008311810050.G3-11_A3-E3_Error_Code_Troubleshooting.pdf
Check out Link for help.
I have same problem.

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Oct 24, 2010 • Bosch ProTankless GWH 715 ES LP Tankless...

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The water fluctuate very hot to very cold and sometime runs for long time before getting hot water. bosch gwh 715es

either you main controller is bad, or the thermo couple is faulty

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

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Jul 22, 2010 • Bosch ProTankless GWH 715 ES LP Tankless...

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We have a 3 year old Bosch GWH 425 HN tankless LP water heater. quit working. plumber has been working on it. replaced the hydro generator and still not working: no spark at pilot. Any ideas ? ...

suggest you complain to Borch sometimes lemons get through best of luck

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The manual says to hold a match near the pilot while the ignitor is trying. It says that if the unit lights the pilot orifice may be dirty or clogged. Then the manual says to check the voltage on the igniter. It should be 1.3 volts DC minimum if it is not means the electronic control box is defective.

Let me know the status ...Kevin

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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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Mar 16, 2009 • Bosch ProTankless GWH 715 ES LP Tankless...

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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.

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

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Bosch Tankless GWH 715 Powers on but does not ignite. Reset does not do anything. Diagnostics not working i.e., water flow 00 but water flowing. May be faulty control unit but how do I confirm?

3 Answers

David Spradling

Jack DeFender

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Bosch Tankless GWH 715 Powers on but does not ignite. Reset does not do anything. Diagnostics not working i.e., water flow 00 but water flowing. May be faulty control unit but how do I confirm?

3 Answers

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Jack DeFender

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