Technician Mike responded to a call concerning a tankless water heater not providing hot water. Upon arrival Mike met Srinivas who directed him to the back of the kitchen where the existing Noritz tankless water heater is. First looking at the unit you can see the digital panel flashing error code 51 indicates a problem with the gas solenoid. Mike then presented an extended diagnosis option to Srinivas to contact tech support and evaluate the system. He agreed. Mike then contacted Noritz tech support. They had Mike remove the front plate of the unit, and the metal plate in front of the manifold. They then had Mike run through a series of numbers on the digital panel. Mike also sent multiple pictures to them as well. Noritz said there is less than a year left of the warranty and they will be shipping repair parts to the restaurant. The repair parts consist of the heat exchanger, thermal fuse, manifold, burner, ignition rods, and igniter. Mike then put both plates back on the unit an