Easy solutions for C2 11:
Rheem is one of the big manufacturers but has disproportionate number of questions at fixya since they try to funnel problems through service techs instead of posting do-it-yourself service bulletins. People want do-it-yourself service bulletins, as appear on the Bosch site for their products. Easy-fix in this sense would be to buy Bosch, and read service manuals aforehand to see if you have testing skills and equipment to maintain and repair tankless water heater.
Easy solution for C2 11 Rheem problem is don't install gas tankless water heater, since all costs are energy and tankless are expensive to install, maintain, repair, and replace for the mere savings of 1-8 per month.
Third solution for C2 11 no-ignition is to clean burner and combustion parts, and sand carbon off the igniter, on a yearly basis, as recommended in manual.
Fourth solution is to call a qualified service technician each year as recommended in manual, and have technician fix problem and catch water heater up on recommended service. This person can check other causes for C2 11 such as bad igniter, bad gas solenoid, low gas pressure, air in gas line, improper unit grounding, bad wiring, bad sensors, etc.
This check-up can also make sure vent drain is working properly and that acidic water vapor and other resulting combustion by-product are going into the household drain and eventually out to sea instead of dripping down into the heat exchanger causing rust and premature failure of exchanger.
Next solution will not solve C2 11 error code, but can address other error codes before they happen: Maintain water heater on yearly and monthly basis as recommended in manual. This is good for folks who like projects.
http://waterheatertimer.org/pdf/Tankless-maintenance.pdfMore resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html1-800-432-8373
http://waterheatertimer.org/How-to-install-gas-water-heater.html
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