Before calling service technician, open following link for Bosch troubleshooting resources, including error codes, manual, Bosch contact info, and service bulletins.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.htmlError codes are starting point for troubleshoot.
e2 is cold water temperature sensor fault.
Bosch error code says: 1) Check connector on wires coming from top of water valve for a
secure connection. 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.Another contributing cause can be temperature thermostat set very high and tankless sensor is going bad, and very cold incoming water, or combination of factors above.
Also read manual for advisories and required maintenance. Some units require water filter be cleaned monthly.
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