Code errors tankless WH

Experiencing a code 90 or 16 on your Noritz tankless hot water heater? Very common is also error code 11,12,17 on Rinnai. Navien error codes 003,515. Don't listen to the average plumbers! Give us a call- we can fix it! 90 days warranty on all repair work that we have done on tankless water heaters! Yeah, even if its 10 years old, we are sure enough to warranty our work!