Question about Bosch & Tankless LP Hot Water Heater

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A2 error on Bosch tankless water heater

What could be the problem? Hot water is only available for a few minutes to a few seconds after the reset button is hit.

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  • 2 more comments 
  • zbuchs Mar 14, 2009

    My heater did not have the flue gas limiter, but when I added one in place of the overheat cutoff fuse, it solved the problem

  • Anonymous Apr 12, 2009

    i have an a-2 error code. i cannot reset. soon as i power up it comes on. i think it could be the over heat protection circuit. can you give me some input on this error code.

    rich

  • Anonymous Mar 16, 2014

    hot water for few minutes, then cold

  • Anonymous Mar 27, 2014

    Heater fails even after being reset

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  1. Check continuity of the flue gas limiter (see Fig. 63, page 46 of manual). Go to steps two and three to determine air box temperature sensor fault and replace it.
  2. Check for flue gas leakage around the top and bottom seals of heat exchanger as well as the viewing window.
  3. Check that venting is within specifications (see Section 3.3 of manual). Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
  4. Check that flue gas limiter connector and spade connections are secure.
  5. Unplug heater and check the two main plug connections inside the control board.

Posted on Jan 23, 2009

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BOSCH 250SX TANKLESS WATER HEATER A2 ERROR


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A2 AF sounds like Bosch tankless
Before calling service technician, copy following links for troubleshoot resources:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
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Jul 16, 2012 | Water Heaters

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I have had Bosch 250 sx ng heater for the last three years with continuing problems maintaining consistent hot water. Either the unit will not heat up or during a shower when you add cold water to cool the...


Here's Bosch's A2 error code pdf:
http://waterheatertimer.org/pdf/Bosch_A2_error_code_troubleshooting.pdf

Want the truth?
I answer Bosch, and other brand water heater questions at fixya.
Never, ever install a tankless water heater unless your wallet is 2" thick and you enjoy nuisance problems that you can occasionally fix yourself plus doing recommended continual maintenance.
Tankless with never pay back, otherwise the news would be filled with stories of people saving money. The only reports of savings comes from sellers of the product. Averages savings on gas bill is $1-8 per month, but all costs are energy.

I cannot recommend a solution to fix the Bosch problem if trained service reps cannot solve problem.
If other product-owners report same problem with that model, then problem is likely related to software and/or PB-board problems, which is same as saying your computer motherboard is no good. And most people know that when a computer motherboard has failures, then the computer is unreliable and should be replaced.
Always research a product before buying.
You can solve most tankless problem yourself, same day, no waiting for parts, Sept 2011, for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sell the defect tankless for parts, or get up to $12 per 100 pounds for scrap metal at the recycler.
Other resources that you can read:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Sep 21, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Getting A2 code and hot water shuts off. We do a reset and hot water will run for awhile then we get A2 code and no hot water again.


Thanks for stopping by:

A2 error on your Bosch water heater means "Fault in the flue gas limiter"

This can be caused by several things:
The gasket on the flue gas collector may be dislodged/leaking.
Check/Remove/Reseat the gasket.
It will not reset until about a two hour cool down.

Also - check the overheat sensor fuse wire - it may have gotten hot and melted the jacket and/or been dis-colored.

Finally - there is a retrofit kit "repair" that can be obtained by calling them directly.

1-800-642-3111 and request the "FLUE GAS LIMITER RETROFIT", Part NO. 8-700-400-032. This should solve many error code situations and get you on your way again.


Thanks for using FixYa!!

Aug 03, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

A2 code appears and there is no hot water in the house. what should i do?


A2 is "fault in the flue gas limiter"
Open following link for 5 possible self-hep options before calling technician.
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

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.

Mar 30, 2011 | Bosch AquaStar 250SXO-LP-RE...

1 Answer

Code A2 can I fix or do I need a plummer?


Generally, the easiest solution for Tankless problems is call service technician who can give tips and tricks for maintaining water heater. Tankless require yearly maintenance which offset promised energy savings of $8 to $100 per year over tank-type heaters. But tank-type need maintenance too. Save and read manual.

Error code A2 shows 5 initial things to try:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

For Bosch tankless troubleshoot resources including link for finding service technician:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
For Rheem tankless resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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.

Feb 17, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Tested my bosch 250 sx with no gas hookup a2 error showed up.I s this possible wit no gas hookup yet?


1) Error code A2 shows on following link:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

2) 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

3) As a general rule, tankless are best when installed by experienced, trained technician.

4) This is partly because Tankless manufactures refer you back to installer when there is a problem, and party because so many factors affect tankless operation.

5) Tankless require perfect alignment of factors to work properly, including vent, air supply, gas supply, combustion maintenance, water flow, water pressure, water quality, overall maintenance, plus internal parts working in harmony.

6) 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.

Feb 09, 2011 | Bosch AquaStar 250SXO-LP-RE...

3 Answers

Water turns cold very quickly


I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!

Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

Jul 06, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

Bosch tankless heater flucuates hot cold?


It sounds like you have a plumbing cross over or a poor install. Check boschhotwater.com to find a service technician and have a Bosch service provider look at it.

Mar 06, 2010 | Bosch & Tankless LP Hot Water Heater

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