Rinnai tankless hot water heater error codes will indicate a self diagnostic fault codes, usually involving the     airflow code 10 ,     ignition failure code 11 ,    and flame failure code 12. 

Rinnai trouble shooting involves checking the gas supply, cleaning air filtering and checking the filters, make sure you have proper exhaust venting. Most error codes can be cleared by resetting the unit or fixing minor maintenance issues.

The mommon Rinnai Error Codes are listed here.

 Error Code 03: Power interruption during bath fill

l Error Code 10: Air supply or exhaust blockage

 Error Code 11: No Ignition (gas issue)

 Error Code 12: Flame Failure not staying lit 

 Error Code 16: Over Temperature Warning 

 Error Code 14:Thermal Fuse Activated overheat

 Error Code 19: Electrical Grounding Issue 

 Error Code 25: Condensate Pump Trouble

 Error Code 31: Burner Sensor

 Error Error Code 62: Fan Motor Fault 

 Error Code 71: Solenoid Valve Problem

 Error Code LC: Scale Build-up Tankless needs a flushing descaling. 

More tankless water heater error codes can be found here at Tankless hot water heater service Ltd. And more tankless hot water codes here as well . Clarkson Comfort zone heating and air conditioning. Tankless hot water heater error codes Ontario Canada, Rinnai, Noritz, Rheem, Bosch, Emax, Chronomite, Navien, Rinnai, Noritz, Bosch, Rheem, and A.O. Smith,Stiebel Eltron,Rhuud, A O Smith, Takagi, Bradford White, Ecotemp. Onsen, Vevor, Enercare, Homedepot, Canadian Tire, Lowes.