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From what I'm seeing this means that there is a bad part within your furnace and it needs to be replaced. It might be the thermostat. You might need to reach out to a local HVAC company to diagnose the issue in person.
Error code 36 does not show in any resource, including 2008 service manual, or 2012 product manual. Check that remote control display is illustrating the correct number. For example there is error code 35.
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.html http://waterheatertimer.org/pdf/Error-code-13.pdf