Question about Bosch AquaStar 125FXKIT-NG 125FX Natural Gas Tankless Water Heater w/ Hood

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What's up with My Bosch Hot water heater??

My bosch is 5years old and i've never had any problems. The last 2 weeks the pilot light has been going ou. We could refire it up, by following directions on the H2O heater. Now when we try to light the pilot light it will only stay lit until we take our finger off knob. As soon as we do the light gose out. What do you think????????????

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It sounds like a thermocoupler
its located inside the unit next to the pilot flame and should be screwed in next to the pilot button at the other end

Posted on May 28, 2009

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I have a bosch aquasar 125b tankless water heater and the burners do not light when hot water is turned on this also causes the pilot light to go out


possible faulty pressure switch connected to the water line and that is failing to turn on the main gas tap solenoid
best have it checked by an accredited gas fitter or service center for the make

Aug 20, 2016 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

I have a Bosch 10P water heater. Pilot light has blown out and while trying to relight the pilot the stop button has been pushed down and won't pop back out. What am i doing wrong? Cheers


What leads you to suspect that pilot blew out instead of another problem?
Fact that pilot will not relight, indicates other factors at play.

Open following link for Bosch troubleshooting resources including manual, and Bosch contact info:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Best place to start is your manual.
http://waterheatertimer.org/pdf/Bosch_10P-installation.pdf

1) Manual recommends 'cleaning by authorized person, never less than once a year.'
Tankless water heaters, and most newer tank-type gas water heaters, are highly technical and finicky devices that require continual maintenance, with tankless requiring 'yearly' maintenance while tank-type require 'periodic' maintenance.
2) Troubleshoot in manual says 'no gas supply' or 'blocked pilot' replace pilot injector

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 21, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a bosch system 21e it is, i was told to ignite the pilot light, can you tell me how this is done?


Consult your owners manual.
http://www.bosch.com.au/content/language1/downloads/70R_UserManual1023.pdf
Heres a new one if you don't have or lost yours. You can't, you got bad advice. tankless system don't have a running pilot light. They operate by detecting water flow and then turning on. Many also state on the lighting instructions to NEVER try and manually light the pilot. Try Bosch tech support. Lowes sells Bosch heaters and they might be able to help you get the support number faster. Hope this helps but please don't go sticking a flame inside there.

May 16, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Hi, My Aunty and Uncle have a Bosch Hydropwer 16H at there holiday house. About a month ago the heater would not produce a spark, they got a plumber out to have a look at the heater. He said it was the...


No, I do not know.
Open following link for Bosch troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Tankless require yearly maintenance as covered in manual. They require correct venting, gas pressure and/or electric current, they require specific incoming air quality, incoming water pressure and flow, and can stop working with basic electric problems, plumbing problems due to check valve or sediment blockage in line, or single-handled faucet crossover, and the myriad of sensors and parts each work together in a specific pattern that can be interrupted by any small or large failure, or by multiple half-failures. As a general rule, repairs are not do-it-yourself, and each part has an installation protocol. But it's supposed to last 20 years, while the maintenance, parts and service will exceed the expected 1-8$ per month savings.

Solve problem for 317$ at Lowes:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Do yearly maintenance, and this too will last 20 years with cheaper parts and cheaper overall cost, since all costs are energy.

Apr 21, 2011 | Bosch Water Heaters

1 Answer

I have a Bosch Water Wizard 10P - have no hot water, no water comes out the hot water tap, can't light Pilot Light, not sure where to start would love a step by step diagram how to start pilot light -...


Open following link for Bosch tankless troubleshooting resources, including Bosch contact information, typical manuals, error codes, tech support, parts, fuel-saver calculator, service bulletins, water heater forum, fixya links, disclaimers, and links for finding service technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Before calling service technician, read manual for fault finding and possible solutions.
Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.
http://waterheatertimer.org/pdf/Bosch_water-wizard.pdf
http://waterheatertimer.org/pdf/Bosch_13P_16P_In.pdf

Following links talk about keeping pilot lit, and describe location somewhat. Bosch water wizard has standing pilot light.
http://www.fixya.com/support/t2961646-water_wizard_10p_pilot_light_keeps_going
http://www.fixya.com/support/t2960079-bosh_water_wizard_10p_pilot_light_keeps
http://www.fixya.com/support/t6182021-bosch_10p_tankless_hot_water

1) The manual does not show diagrams you asked for.

2) Website that sells Bosch parts does not show parts for water wizard, nor does Bosch site for parts: Instruction manual says: replace pilot injector
http://www.boschhotwater.com/HelpfulResources/PurchaseParts/tabid/837/Default.aspx
http://www.houseneeds.com/shop/heatingproducts/waterheating/parts/bosch2400espartsbuy.asp#

3) Searching "pilot injector for Bosch Water wizard" turns up fixya questions which is generally bad news for do-it-yourselfer because it means information sources are through service technician.

4) As a general rule, tankless are not do-it-yourself repairs or installation because they are affected by so many internal and external factors, including air quality, air flow, venting, other gas appliances, gas pressure, gas supply, water pressure, water flow, plumbing problems, water quality, plus internal parts and including any combination of things listed above..
Replacement parts each come will disclaimer.

Add a comment with your experience so others with same-similar problem can benefit.
Send some photos so the internet can see the problem.
http://www.fixya.com/support/r6568559-post_photograph_fixya_questions_answers

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 03, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I have a Bosch GWH 425 HN Tankless Hot Water Heater...On 2/28/2010, it began intermittant exploding when demand for hot water occurred. Local technicians worked on the unit several times, changed and...


I have the same problem with the same model. The problem has been identified by a friend of mine, correctly, I think.
This is a very dangerous problem involving Bosch's much touted safety feature, ironically enough. IT IS THE FLAME SENSOR IN THE GAS VALVE. The flame sensor is supposed to confirm that the pilot has lighted BEFORE the main gas line sends gas to the main burners, after which the pilot shuts off. The pilot light is not coming on, the sensor that shouldn't let gas fto the main burners is failing and the main gas is flowing and ignighting from the spark that is supposed to light only the pilot in a big explosion.
This is the 2nd unit of this model that has failed. I think Bosch should do a recall

Apr 25, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

I don't know how to restart my old bosch water wizard 10p, pilot light has gone out.


get a long stick match, a flashlight remove lower inspection cover, find thermocouple and pilot light will be next to it,turn gas valve to pilot light and hold down,stick the match in by thermocouple till the pilot lights and hold valve down till pilot stays lit,this may take a minute or more,then release gas valve and see if pilot stays lit, if not retry,if it wont stay lit,the thermocouple is defective and needs replacement

Jul 12, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch Water Wizard 600 pilot light keeps going out


You need a new thermocouple. Its the little stick like thing that the flame heats up to tell gas valve to open.

Jun 15, 2009 | Bosch Water Heaters

1 Answer

No hot water, pilot light lights but no burner ignition


Thermo coupler may be defective. it controls the main gas valve by closing main if pilot is out. make sure thermo coupler bulb is positioned over and near tip of pilot flame, but not in the flame. Thermo couplers are inexpensive and easy to change out.

May 05, 2009 | Bosch & Tankless LP Hot Water Heater

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