Question about Bosch AquaStar Indoor Natural Gas Tankless Water Heater with Vent Hood #125

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I have a Bosch AquaStar AQ-125-BNG tankless water heater. It has worked very well until recently. The problem: The hot water at the tap is turned off, the flame on the main burner keeps burning and eventually overheats and completely shuts off including the pilot light. Any ideas?

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There is a small dia copper pipe which has a thermal coupling on it the end of it sits in the flame of the pilot light,
if it fails which it does after about 25-15 months,it shuts down the gas burner

Posted on Jul 05, 2010

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Posted on Jan 02, 2017

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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

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sounds like pressure relief valve is stuck closed free of or replace

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I have a Bosch AquaStar AQ-125-BNG tankless water heater, and for some reason when it is heating the water, it seems to get exremely hot and the heat is radiated back into the cold water supply line and...


Tankless should never be installed with plastic pipe, PVC or CPVC etc.

Before calling service technician, 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

Read manual cover to cover, make sure tankless receives yearly maintenance as outline in manual.

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.

Apr 02, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

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I have a aqua star 125 bng-l ser 9650617 the only way i can get water hot is by turning on the shower annd the bathroom tap on?


These type of heaters require a minimum amount of water flow. If your showerhead is the most common flow-restricting type then perhaps it is not permitting the minimum amout of gallons per minute to flow through the unit for it to remain engaged. You might have to try removing the flow restrictor :(

Feb 04, 2011 | Bosch AquaStar Natural Gas Tankless Water...

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Water is only getting warm with aquastar 125 bng model. It just started getting warm and not hot. What could be the problem?


Insufficient gas presure. Check gas presure exiting regulator exrternal of water heater. If presure is at 3.7-inches water column gas valve is defective.

Jan 16, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

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I have a Bosch 125 BNG gas tankless water heater. Pilot light will not light but spark is there. Solution and where do I get parts assuming needed.


Check and be sure gas knob is in the pilot lighting position and pushed in. Try to manually light with a match. Make sure gas **** is in the on position. Posible air in the gas line. Bled off air. gas valve or regulator has failed..

Jan 04, 2011 | Bosch AquaStar Indoor Natural Gas Tankless...

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My aquaStar 125 BNG,will not shut down automatically when water turned off.


The water valve may be dirty and sticking, prohibiting it from fully closing the gas valve. This part needs to be periodically serviced (every 2-5 yrs depending on water quality and use) Purchase a water valve rebuild kit to service water valve.
This answer is off the Bosch site.
If this answer is not satisfactory, do not feel obliged to accept it!
Gary.

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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,,

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Tankless water heater pilot light will not stay on


It is most likely the water valve stuck open, telling the controls to heat water, that it thinks is flowing through it, but without actual flow it overheats. Depending on how comfortable you are with taking it apart yourself, you could open the valve to see if it just needs cleaned out, or if you have a ruptured diaphragm or some other cause.

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