Question about 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).
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
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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
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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,
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