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Error code 63 on Bosch 32q

No hot water. Error message 63

Posted by Anonymous on

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Posted on Jan 02, 2017

SOURCE: Bosch hot water service error code 90

I can help steer you to resources, including Bosch contact numbers and possibly your manual and other helpful information:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Posted on Jun 20, 2011

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The display should show an error code. Here's a list http://hometips.me/Tls/Bosch-error-codes.pdf

Feb 16, 2014 | Bosch & Tankless LP Hot Water Heater

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My bosch tankless water heater is flashing ae


Before calling service technician, open following links for Bosch error codes, and contact information, and possible product manual for your model, etc:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/pdf/Bosch-GWH2400ES-error-codes.pdf
http://waterheatertimer.org/pdf/Bosch_A4-E4_error_code_troubleshooting.pdf

Error code AE is not shown, but error EA means "burner flame not recognized by control unit when water is flowing"

There is also error A3 and A3 E3: jumper connection is not correct

Sep 26, 2011 | Bosch & Tankless LP Hot Water Heater

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No hot water at all when I turn on the hot water faucets nothing nomad I would hear the burner kick on but nothing what so ever


Before calling service tech, open following links for Bosch troubleshoot resources including phone support, error codes, possible manual.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

No error code can mean PC board failure, or plumbing problem
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Aug 13, 2011 | Bosch AquaStar 125FXKIT-LP 125FX Liquid...

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We have to reset daily A-7


Before calling service technician, open following link for troubleshooting resources including error codes, manual, links to bosch, phone number, :
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

A7 is outlet temperature sensor fault.
Temperature below freezing or above 210 degrees F

1) Check red wire connections at hot water temperature sensor. Clean terminals with an eraser. If badly corroded, replace sensor and wire harness. (See Fig. 63, page 46 in manual).
2) Sensor may trip if water temperature drops below freezing to protect heater from freezing conditions. Any damage due to freezing conditions is not covered under warranty.
3) Clean inlet filter screen and clear any debris out of shower heads, faucet aerators and whole house filters.
4) In areas where water has a high mineral content, periodic descaling may be necessary.

Apr 17, 2011 | Bosch AquaStar 2400ES-NG

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Pilot OK main burner does not flare when hot tap turned on


If you are not getting error code, then problem could be plumbing.
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Many internal and external factors can also cause tankless problems without error code.
Circuit board failure, sensor failure, incoming air, venting, gas flow, water pressure, water flow, or combination of factors.

Open following link for Bosch troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Add a comment with your experience to help others with same-similar problem.

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 25, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Getting an A7 error code and no hot water


1) BOSCH error code A7: Outlet temperature sensor fault (Temperature below freezing or above 210?F).
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
a. Check red wire connections at hot water temperature sensor. Clean terminals with an eraser. If badly corroded, replace sensor and wire harness. (See Fig. 63, page 46 in manual).
b. Sensor may trip if water temperature drops below freezing to protect heater from freezing conditions. Any damage due to freezing conditions is not covered under warranty.
c. Clean inlet filter screen and clear any debris out of shower heads, faucet aerators and whole house filters.
d. In areas where water has a high mineral content, periodic descaling (de-liming) may be necessary.

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

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

4) Read manual cover to cover
and make sure maintenance is scheduled.
For example de-liming is recommended each year.
Utube search de-lime tankless water heater

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.

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A2 error on Bosch tankless water heater


  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.

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