Rinnai Error Codes

22 Rinnai codes across tankless water heater.

Rinnai Tankless Water Heater Codes

02 02 — Power Interruption / Memory Loss 03 03 — Loss of Communication / EZConnect Issue 10 10 — Air Supply or Exhaust Blockage 11 11 — No Ignition 12 12 — Flame Failure 14 14 — Thermal Fuse / Overheat Cutoff 16 16 — Outgoing Water Over-Temperature 25 25 — Condensate Drain Blocked (Condensing Models) 31 31 — Burner Sensor (Combustion Offset) Fault 32 32 — Outgoing Water Thermistor Fault 33 33 — Heat Exchanger Thermistor Fault 34 34 — Combustion Air Temperature Sensor Fault 51 51 — Gas Solenoid Valve Fault 52 52 — Modulating Solenoid Valve Signal Abnormal 61 61 — Combustion Fan Motor Fault 65 65 — Water Flow Control Valve Fault 70 70 — PCB / Control Board Fault 71 71 — Gas Solenoid Drive Circuit Fault 72 72 — Flame Sensor Fault 90 90 — Combustion Abnormality 99 99 — Exhaust Blockage / Fan Issue LC LC — Scale Buildup / Descale Reminder