Question about Bosch Water Heaters

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Hi, I have a Bosch tf 400 ng 1tr, about 7 years old, just today it started producing only 1/2 the heat. Any suggestions ( I have gas experience on cookers and stoves) so I should be able to fix if I'm nudged in the rite direction.

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You ask for free nudge:
I have links for resourceful do-it-yourselfer since tankless is large and developing field that can take years of study.
For example tankless are prone to lime build-up and must be de-limed each year. Search utube for 'delime tankless' to help restore efficiency.

Best place to start is troubleshoot section in your product manual.


1) BOSCH website is easy to navigate:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx

2) Bosch manuals:
http://www.boschhotwater.com/HelpfulResources/BrochuresManuals/tabid/354/Default.aspx

3) Bosch problems at Fixya:
http://www.fixya.com/support/p949576-bosch_1600h_lp_liquid_propane_aquastar_a/solutions

4) Bosch has online tech support form:
http://forms.boschhotwater.com/Home/BoschTechSupportForm/tabid/614/Default.aspx

5) All costs are energy. Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://waterheatertimer.org/pro-n-con.html

6) Add a comment for more free help.
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.

Posted on Mar 16, 2011

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Water is way too hot. Five year old GWH2400E NG is giving error code EC: Ionization failure during operation. set point temperature = 106, inlet water temp = 88, outlet water temp = 171, water flow = 12,...


Before calling service technician who has service manual and can test which part has failed, open following links for troubleshooting resources including steps below and phone number for Bosch:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ETechSupport/Troubleshooting/tabid/1131/Default.aspx

Clean inlet filter
Check all faucets for clear pathway
This unit does not work with preheated water (solar assisted)
Incoming water above 70 degrees, avoid restricted faucets
Check that both temperature sensors are making contact and firmly mounted on respective cold and hot pipes.
Descale heat exchanger
http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G2-13_Descaling.pdf

Aug 16, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Gas outdoor mounted AQ250 won't stay lit. Unit is about 2 years old and has been working great.


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

Sample manual has troubleshoot section and yearly maintenance requirement.
http://waterheatertimer.org/pdf/Bosch-250SXO.pdf

Service bulletins for 250SXO
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/250SXOTechSupport/ServiceBulletins/tabid/573/Default.aspx

Tankless require yearly maintenance as outlined in manual.
No tankless manufacturer suggests do-it-yourself repairs on their product, in part for liability and danger to customers, but for long-term customer satisfaction.
Repairs and yearly maintenance will eliminate the $1-8 monthly energy savings expected from owning tankless.

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Replaced thermocouple on Bosch TF250. Now the pilot flame is so big that it heats and boils the water in the heat exchanger when hot water is not required. When we turn the tap on, we get dirty water,...


Before calling service technician, open follow links for troubleshooting resources.
Bosch site does not show TF250, but shows 250SX and 250SXO.
Gas Products Technical Support: 800-642-3111
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx

At no time when visiting tankless website have I read suggestion that people fix tankless as a do-it-yourself project. In fact each site says repeatedly to call service technician for installation and repairs.
When reading service bulletins, the repair protocols are generally long and very sequential, even if a thermocouple seems straightforward there are many interrelated parts and sensors that must communicate exactly with each other.
Example: following pdf outlines operation sequence for non-standing pilot model
http://waterheatertimer.org/pdf/Tankless-gas-operation-overview.pdf

The dirty water also suggest that tankless has not gotten regular maintenance that is required for continued operation. Tankless are not install-it-and-run-flawless-for-years type of machine.
Read manual for specific maintenance required for your model. For example yearly flushing the heat exchanger with vinegar to avoid lime build-up is suggest most models. Tankless are succeptible to lime build-up.
All costs are energy. Maintenance alone can easily eat up the promised $1-8 monthly savings from tankless vrs tank-type water heater. One service call can wipe away years of expected savings, plus replacement part can sometimes cost as much as whole new tank-type water heater, installed.

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None !!
3/4 pipe from gas meter or regulator. At low pressure there may not be enough gas flow through a smaller pipe for the boiler when on full bore.
The boiler input pipe will be 1/2" needing a reduction from 3/4 so there is some leeway.
I have about 8' of 1/2 pipe on mine [Bosch Worcester] from the reg. and it is ok.
You could use the existing 1/2 and try. No harm done if insufficient-just replace. If you have some other gas takeoff on the same line a 3/4 pipe up to that take off is most likely.

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1 Answer

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You have to fix this leak around the water valve before
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2. Unplug or close the natural gas valve.
3. Now, you can work fixing the leak.
4. Once completed, you can proceed to open the
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5. Then, have it tested to get it done.

5.

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3 Answers

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2 Answers

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1 Answer

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I know that this is a great answer but with out being there its hard to answer you call there tech support they are great, I have had to call they from jobs before they can help
Phone Support:
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729

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