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
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