Perform full diagnostic on existing tankless Includes: -performing yearly descale maintenance on tankless water heater -pulling and cleaning heat exchanger -pulling and cleaning flame rods and ignition plug After arriving to the home the homeowner made me aware that over the last year he has intermittently been getting code 11 on his tankless water heater and within the last week he has been getting the code every time he attempt to use hot water, he also made me aware that the unit has not been serviced in the six years since it has been installed, after getting approval to perform a full diagnosis of the system I found that the unit is getting the correct gas pressures both at the inlet and in the burner assembly and the gas is modulating correctly, and all electrical components for the system or operating correctly indicating that it was time that the unit Be D-scaled, as well as have the burner assembly pulled and cleaned, after presenting up front pricing I gained approval and