Tankless water heater repair. Error code 10 was showing up on the Rheem tankless heater when I arrived, but the unit was still functioning and giving hot water. I blew out the intake and exhaust with nitrogen, cleaned the flame sensor and ignitors, and blew through the condensate trap on the unit and made sure it wasn’t clogged. I talked to customer support, and they let me know the intake and exhaust could only be a max of 24” apart, and we are over 5 feet. And both intake and exhaust need to extend 1’ past the overhang. It currently is not, and has to be a minimum of 1’ below the overhang to work properly. It is currently only 4”. Need to come back and repipe the intake/ exhaust pipe to Rheem specs. Will talk to Dave about pricing and code. After going through the process of heating, I turned the power off for 10 minutes at the breaker, and the code was gone when I turned the power on, and everything is currently functioning.