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Ultra force water heater error code a7 - Water Heaters

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Posted on Jan 02, 2017

SOURCE: getting an A7 error code

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.

Posted on Mar 11, 2011

SOURCE: what is an A7 code?

Before calling service technician, open following links for Bosch troubleshoot resources:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are start-point for troubleshoot.
A7 is temperature sensor fault.
This can be bad wiring, corroded wiring, failed sensor, very high temperatures due to other part failure.
Other cause can be water filter clogged, lime and scale inside heat exchanger, faucet aerators clogged, or combination of problems listed.

Each tankless manual across all manufacturers suggest maintenance schedule: clean water filter monthly, delime heat exchanger yearly, and yearly service of burner and other parts by trained service technician which can address cause of most error codes, and might solve some problems before they happen.

If tankless becomes chronic issue, solve problem yourself, same day, for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Posted on Jul 31, 2011

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Mar 31, 2017 | Bosch Water Heaters

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My Bosch Water Heater keeps going off. I reset it and then A7 keeps coming up. We had a power outage for about 6 days. I do not have the manual. Do you know what it is and how to fix it? Thank...


Questions might be asking for a manual, and asks what error A7 means, and asks how to fix error problem, but model number of Bosch heater is not given.
Error codes are start-point for troubleshooting, and can include multiple causes.
So following answer provides general do-it-yourself resources, without saying that problem can be 100% diagnosed or fixed by homeowner.

1) Error code A7 is outlet temperature sensor fault.
Problems include: need for descaling, dirty inlet water filter, debris in faucet aerators, dirty wiring terminals, bad wiring harness, or bad temperature sensor.
http://waterheatertimer.org/pdf/Bosch-GWH2400ES-error-codes.pdf

2) Before calling service technician who can test failed parts and catch tankless up on yearly maintenance, open following links for Bosch resources including error codes, phone number, possible manual, and descaling instructions, and cleaning inlet filter:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://waterheatertimer.org/pdf/Rheem-De-lime-tankless.pdf
http://www.boschhotwater.com/Portals/7/TechBulletins/TWH-G1-12_Cleaning_inlet_filter.pdf

3) Product manual: Question posted under model 125HX-LP
Open following link for possible manual:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125HXTechSupport/InstallationManuals/tabid/542/Default.aspx

4) Do it yourself service bullitens for 125HX-LP
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/125HXTechSupport/ServiceBulletins/tabid/548/Default.aspx

5) Take a moment and rate answer:
And 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.

Sep 07, 2011 | Bosch AquaStar Propane Tankless Water...

1 Answer

What is an A7 code? Gas hot water heater


Before calling service technician, open following links for Bosch troubleshoot resources:
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/2400ESTechSupport/Troubleshooting/tabid/1295/Default.aspx
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

Error codes are start-point for troubleshoot.
A7 is temperature sensor fault.
This can be bad wiring, corroded wiring, failed sensor, very high temperatures due to other part failure.
Other cause can be water filter clogged, lime and scale inside heat exchanger, faucet aerators clogged, or combination of problems listed.

Each tankless manual across all manufacturers suggest maintenance schedule: clean water filter monthly, delime heat exchanger yearly, and yearly service of burner and other parts by trained service technician which can address cause of most error codes, and might solve some problems before they happen.

If tankless becomes chronic issue, solve problem yourself, same day, for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Jul 31, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

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

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.

Mar 10, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

We are getting A7 error on Bosch 2700ES. Is our water too cold going in? We are in on well water system in Alaska. Do you have any solutions on how to get it to come back on?


Here is the A7 code for this heater:

Outlet temperature sensor fault

(Temperature below freezing or

above 210°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. 65, page 48.

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.

I would be very surprised if your water temp is below freezing, even in Alaska, check it with a thermometer. Well water is usually around 45 degrees F.
Let me know,
Gary

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