I was called to a home to check on a tankless water heater that was not producing hot water. I checked the filters, flame rods, and condensate trap. I flushed the tankless water heater and checked the gas line going to the unit. I found that the gas line was incorrect and was throwing a code 11. I called Rheem to send a technician to the home to fix the issue. I also asked that Jordan, another technician, be sent to the home to check the issue as well.