1) Copy following link for EcoSense-Rheem tankless resources:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html
2) Error 13 is oxygen depletion sensor activated.
Get more fresh air to unit
Perform required maintenance.
Have qualified service technician test, clean, etc, and possibly replace burner.
3) Repair any brand tankless, same day, yourself for $368
http://waterheatertimer.org/How-to-install-gas-water-heater.html
4) Add a comment and say what you did to solve problem.
If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
SOURCE: Rheem RTG-74PVN-1 Water heats for abot 2 minutes
overheat stat or fan, on fan check for small pinhole in rubber tube best of luck
SOURCE: What is error code c2 76
Lost comm. between the remote and the burner control circuit board.
SOURCE: Rheem water heater turns off by its self
Flashing code 76 is lost communication between the remote and the burner control assembly CCA (circuit card assembly). The CCA is still under warranty if purchased within the last 3 yrs. Contact Rheem customer service and have your Mod. and S/N available....explain to the agent you are recieving - flashing code 76...they'll walk you through the process.
SOURCE: Problem for Rheem Paloma PTG-74PVN / RTG-74PVN
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
SOURCE: Rheem tankless rtg 74pvn - heater hot water shuts
This is something you will have to contact rheem about due to the fact you don't have a fault code
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