Rheem wants customers to call trained service technician since error codes are start-place for troubleshooting, and problems can be combination of issues.
Risk of CO poisoning from improper vent, or clogged drain line causing damage to heat exchanger, and risk of homeowner working on complicated gas-burning appliances are reasons why Rheem instruction manuals recommend yearly maintenance by trained technician.
That maintenance would typically cover most common error code issues, and homeowner could gather tips and information from service tech.
Open following links for Rheem troubleshooting resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.htmlhttp://waterheatertimer.org/pdf/Error-code-13.pdf
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