You posted under Bosch electric tankless.
I don't know specifically how to fix your tankless from information given.
Tankless problems can be simple or complex, and include internal and
external factors best gauged by experienced service technician who is there and can put hands on the appliance.
You can also glean information from the service technician how to best maintain your tankless unit, since they require yearly maintenance, such as de-liming.
Open following link for Bosch tankless troubleshooting resources,
including Bosch contact information, typical manuals, error codes, tech
support, parts, fuel-saver calculator, service bulletins, water heater
forum, fixya links, disclaimers, and links for finding service
technician.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
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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