Bosch 2400ES-NG AquaStar is an indoor tankless natural gas water heater and error code EA means No flame detected.
Bosch 1-866-642-3198; 800-642-3111
Copy following links to narrow down cause for EA error code:
http://waterheatertimer.org/pdf/Bosch_EA_error_code_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Aqua star service bulletins
http://www.bosch-climate.us/bosch-hot-water/aquastar-service-bulletins/
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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