Code EL does not show on typical Bosch error code list.
Maybe you have E1 ??
Or Bosch has some other error codes not listed.
http://waterheatertimer.org/pdf/Bosch_E1_troubleshooting.pdf
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
http://www.bosch-climate.us/support-center/technical-support/
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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