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Error code 29 is a high pressure open. possible causes are dirty indoor or outdoor coil. indoor or outdoor fan not running, liquid line Freon restriction, or to much Freon in the unit.
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Copy following link for Rheem tankless troubleshoot resources, including error codes, manuals, and general information for maintaining your tankless computer that heats water. http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html Multiple error codes can indicate failed PC board. Rheem will send PC board... so your computer-that-heats-water might have failed motherboard. Continual maintenance can help avoid common error codes, but some problems are insoluble and chronic.
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.
The neutralizer has a plastic drainage tube going out of the case at the bottom left corner. You need to remove the valve on that tube to let the water drain out freely.
Error code 11 has to do with ignition/gas/gas pressure/electrical grounding. This can be caused by internal part failure or combination of internal or external factors. I suggest reading pdf, and then calling service technician who specializes in your brand.
Open typical manual to review required regular maintenance for tankless on page 29 The word maintenance is used throughout manual, indicating that tankless are a yearly budget nuisance http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf Open following link to view fixya questions on 1 model of Rheem tankless Some older questions have information that is useful, and varied This will give you cross section of problems that are faced by others with same/similar product as yours. http://www.fixya.com/tags/rtg_74pvn All costs are energy. You can also add simple tank-type water heater that can be turned on when tankless is on the blink. http://waterheatertimer.org/How-to-install-gas-water-heater.html
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