Rheem Tankless Water Heater Code 13 means combustion failure and it occurs due to clogged venting or improper vent installation.
![Rheem Tankless Water Heater Error Codes [The Complete Guide]](https://i.pinimg.com/originals/0a/35/ae/0a35aebcf2d4930ba3941b27379234f8.jpg)
![Rheem Tankless Water Heater Code 11 [No Ignition]](https://i.pinimg.com/originals/80/2c/c0/802cc08cdab976f5a1086916ec3226f4.jpg)
![Rheem Tankless Water Heater Code 29 [How To Fix]](https://i.pinimg.com/originals/12/ae/5c/12ae5c51a3976077f59ecaa82f0d21fe.jpg)
![Rheem Tankless Water Heater Code 76 [How To Fix]](https://i.pinimg.com/originals/f0/d9/c7/f0d9c73e2a34ebccb0b8ea089651e829.jpg)
![Rheem Tankless Water Heater Code 76 [How To Fix]](https://i.pinimg.com/originals/b4/55/04/b4550464acdff8054c9c88bcc252caea.jpg)
![Rheem Tankless Water Heater Code 29 [How To Fix]](https://i.pinimg.com/originals/1d/fc/ab/1dfcaba8684382be2ba6abc1106dd91c.jpg)
![Rheem Tankless Water Heater Code 11 [No Ignition]](https://i.pinimg.com/originals/46/11/04/4611041c64c163708ad10c3e7cd20da3.jpg)
