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

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My Bosch aqua star water heater lights but won't heat my water

Cleaned out the pipes got a nice flame but still won't heat the water

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  • 2 Answers

Unplug micro switch located on bottom of water heater if it has one

Posted on Jan 08, 2013

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Posted on Jan 02, 2017

  • 25 Answers

SOURCE: Bosch AQ125BNG gas water heater

First thing I would do is clean and rebuild the watervalve. The watervalve on this heater mandates everything. This watervalve has a maintenance schedule in the manual. She be rebuilt every 3 years. Also sounds like the diaphram in the watervalve may be damaged.

Posted on Jan 19, 2009

  • 2 Answers

SOURCE: why am i getting a A3 error code on my bosch aqua

Question is though, why would this fail after only six months?

Posted on Dec 08, 2009

  • 33 Answers

SOURCE: Bosch Aquastar 2400E LP Does Not Heat Water

Sounds like the water flow sensor and servo, may just need cleaning, get it checked out by a Bosch agent

Posted on Jan 17, 2010

  • 518 Answers

SOURCE: I have a Bosch AquaStar AQ-125-BNG tankless water

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

  • 1 Answer

SOURCE: Bosch 2400E-NG output temp fluctuates

Tankless heaters do not like back pressure from anti scalding devices in shower controls. Every time they compensate and shove more coldwater to the hot side so you don't get burned when someon is using the cold water elsewhere in the home, it can reduce the heater below it's minimum flow rate and shut it down. Nothing wrong with the heater. Ask kohler if there is a wy to disable the device without buying a new unit entirely.

Posted on Jul 26, 2010

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1 Answer

Bosch Aqua-star tankless water heater had water on gas valve, dried gas valve, I have a spark but will not light


Water in the gas valve is DANGEROUS! The major question is did the water come from a leaking heat exchanger or the product of combustion? If it is from the heat exchanger it may be covered under the warranty (if the installation is proper). If it is from condensate in the flue pipe, it is from an improper installation. If you go to bosch-climate.us you can find a service provider in your area. I service a very large part of NY, some of NJ (Northern) and all of CT.

Sep 05, 2013 | Bosch & Tankless LP Hot Water Heater

1 Answer

The pilot light went out on my aqua star 125 BNG tankless water heater. I lit the pilot and the burner started and now the burner won't go out it when I turn the water off Serious business anybody got...


Before calling service technician, copy following links for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Jul 13, 2012 | Water Heaters

1 Answer

It often flashes ea or af and doesnt want to light


Before calling service technician, open following links for troubleshoot resources including common error codes, Bosch contact information, link to service manuals, and possible product manual
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

Call Bosch 800-642-3111
Multiple error codes can mean PC board failure.
AF might be A9, but not sure.
EA is 'no flame ionization detected with water flow'
  1. Verify that all manual gas shut off valves are open.
  2. Check gas type.
  3. Reset error code and open a water tap to cycle the heater in an effort to purge air on new installations. Cycling hot water tap on and off multiple times may be necessary. If heater still faults with EA error code, have a licensed gas technician properly purge air out of the gas line leading to the water heater.
  4. Check three wire connections to ignition group on the lower front of the heat exchanger are secure.
  5. Check gas pressure.
  6. Check venting specifications are met. Improper venting may cause premature failure of the flame sensor rod.
  7. Check that the minimum power fan speed has been adjusted to the proper value.
  8. Observe inside the viewing window of the heat exchanger when a hot water tap is opened. Sparking should be followed by a steady blue flame. If flame is unstable or yellow with proper gas pressure.

Aug 11, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Aqua star runs on and was running water to out side I guess it would be the overflow ( tankless). Had to turn the water off


Problem is not clear

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

Jun 09, 2011 | Bosch 2400ES LP AquaStar 6.4 GPM Indoor...

1 Answer

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

1 Answer

I have a Bosch Aqua star 240 fx tank less water heater. The unit will ignite and run for 5 sec (Flame visible through window) the flame goes out and it reignites and runs for 5 more seconds and again goes...


It sounds to me like you tried about everything I would. So I think you're already thinking about what I would do next. Try the flame sensor,and as last resort check all connection . Remove wires one by one clean and reattach. If all else fails change cotrol board. It's very hard to fix when it's not consistent. Good luck. Thanks

Nov 15, 2010 | Bosch AquaStar Indoor Natural Gas Tankless...

1 Answer

Does grundfos rcp96 pump work with bosch 2400 eo tankless heater?


What is your reason to have a recirc line on your water heater does the heater sit to far away from a certain fixture? If you put a pump on your tankless waterheater then your heater will continually fire till the call for hot water is stopped. Yes you normally do need a seperate line installed for a recirc line usually from the water heater to the farthest fixture away. If your problem is taking to long to get hot water then I suggest installing a second heater closer to problem area.

Apr 16, 2009 | Grundfos RCP-96 Recirculation Pump for...

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