Rheem RTG-74PVN-2 code c776

Code 11 &12 deal with gas issues. What cleaning did you perform?

Check inside the cover of the unit or owners manual to find out what that error code means.

Error code 36 does not show in Rheem tankless manuals.

Copy following link for general troubleshoot and error codes, and Rheem contact information:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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.

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First thing to try for any electronic problem is unplug the machine and see if problem resets.
Before calling service technician, open following link for Rheem tankless resources including error codes and possible manual and Rheem chat and contact:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Error code 2 and 3 do not show on Rheem/Paloma charts or in typical manual.
Error codes are generally considered start places for troubleshooting.
Multiple error codes can mean PC board failure, but same problem on one unit can have different cause and solution than another unit.

Read the manual and make sure yearly maintenance is caught up.

Add a comment and say what you did to solve problem.

Before calling service technician, open following link for Rheem troubleshooting resources.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

The same error code, and apparent problem, on one person's tankless unit can have different cause and solution than another tankless unit.

Repair most tankless problems yourself, same day, any brand, for about $330
http://watergheatertimer.org/How-to-install-gas-water-heater.html

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hi pete here ill try and help this could be 2 things check the sensor on the unit the outher one is a qustion has the gas company changed your meter latley and turned off you gas and not come back to light your poilet because this code also means not enough gas or wrong type of gas

refere to manual is heater working normal ? answer is in manual best of luck

could be overheat stat or fan check the little hose at the fan area for pinhole next choice diaphrapm valve then micro switch best of luck

overheat stat or fan, on fan check for small pinhole in rubber tube best of luck

Lost comm. between the remote and the burner control circuit board.