Question about Water Heaters
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
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).
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:
3) Bosch problems at Fixya:
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:
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.
Posted on Jul 31, 2011
Tips for a great answer:
Oct 30, 2017 | Water Heaters
Jan 05, 2013 | Bosch AquaStar 2400ES-NG
Sep 07, 2011 | Bosch AquaStar Propane Tankless Water...
Jul 31, 2011 | Bosch & Tankless LP Hot Water Heater
Apr 17, 2011 | Bosch AquaStar 2400ES-NG
Mar 10, 2011 | Bosch AquaStar 2400ES-NG
Outlet temperature sensor fault
(Temperature below freezing or
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,
Dec 22, 2010 | Bosch 2700ES-NG Natural Gas Tankless Water...
Dec 05, 2009 | Bosch AquaStar Indoor Natural Gas Tankless...
Jun 12, 2009 | Ultra Max Takagi Flash TH-1 Ultra High...
Jul 22, 2018 | Rinnai Water Heaters
42 people viewed this question
Usually answered in minutes!