Question about Kitchen Ranges

1 Answer

I have an A7 Code showing on my GWH 635ES tankless water heater. What do I need to do? My location is near Stockton, CA.

Posted by on

  • rrostomily75 Mar 31, 2011

    Turned the power off for 30 mins then turned it back on and the error code went away. Thanks for your help anyway.



1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • Master
  • 4,323 Answers


A7 error is a Hot water temperature sensor/receiver defect (from control unit). To solve this issue you will have to check the water temp. sensor and its connections. Before checking that you can also check the room area temperature as it must be above 36 degree Fahrenheit (2 degree Celsius). Hope this helps...please post back for further assistance.


Posted on Mar 31, 2011


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

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

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.
Also make sure you dont have an error code showing. Hold down your reset button for 5 seconds to reset an error code and get back to your set temp.

Jan 02, 2014 | Bosch ProTankless GWH 715 ES LP Tankless...

1 Answer

I have a Bosch GWH 425 HNO propane Tankless Water Heater which began intermittently exploding when demand for hot water occurs.

Call a qualified service tech immediately.
Gas explosion indicates dirty combustion parts, and gas is not fully igniting when tankless turns on the gas. So gas builds up and then explodes causing serious damage to tankless, and serious risk to homeowner.

Aug 14, 2012 | Bosch & Tankless LP Hot Water Heater

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:

Manual for ES high altitude, with installation, error codes and troubleshoot:

I cannot find a service manual, or service bulletins:

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

1 Answer

What is an A7 code? Gas hot water heater

Before calling service technician, open following links for Bosch troubleshoot resources:

Error codes are start-point for troubleshoot.
A7 is temperature sensor fault.
This can be bad wiring, corroded wiring, failed sensor, very high temperatures due to other part failure.
Other cause can be water filter clogged, lime and scale inside heat exchanger, faucet aerators clogged, or combination of problems listed.

Each tankless manual across all manufacturers suggest maintenance schedule: clean water filter monthly, delime heat exchanger yearly, and yearly service of burner and other parts by trained service technician which can address cause of most error codes, and might solve some problems before they happen.

If tankless becomes chronic issue, solve problem yourself, same day, for about $350.

Jul 31, 2011 | 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

Looking for Outdoor Tankless propane water heaters

it will tell you right on the box if it for indoors or out doors either way they have to have a cover over them,,

Jun 09, 2009 | Bosch AquaStar Propane Tankless Water...

1 Answer

Bosch Pro tankless water heater overheating

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.

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

1 Answer

Burner will not light

Try this web site!
Copy & Paste to Google search engine.

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

Not finding what you are looking for?
Kitchen Ranges Logo

Related Topics:

44 people viewed this question

Ask a Question

Usually answered in minutes!

Top Kitchen Ranges Experts

Dan Webster
Dan Webster

Level 3 Expert

8220 Answers


Level 3 Expert

75822 Answers


Level 3 Expert

2463 Answers

Are you a Kitchen Range Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides