Rinnai Water Heater Error Codes & Fix Guides
All FixCode Guide coverage for Rinnai water heater error codes: start with the complete code list, or jump to a deep-dive guide for a specific code. Everything is verified against Rinnai manufacturer documentation.
Guides in this section
Rinnai Water Heater Error Codes List: Every Code ExplainedRinnai Error Code 11: No Ignition — Meaning, Causes & FixRinnai Error Code 12: Flame Failure — Meaning, Causes & FixRinnai Error Code 10: Air Supply or Exhaust Blockage — Meaning & FixRinnai Error Code 17: Meaning, Causes & FixRinnai Overheat & Venturi Codes 14, 15 & 18: Meaning & FixesRinnai LC Code: Scale Buildup & Service Reminder — Flush GuideRinnai Sensor, Fan & Valve Codes (25, 52, 54, 61, 63, 71, 79): Meaning & FixesRinnai Control & Electronics Error Codes (FF, SE): Meaning & FixesRinnai Water Heater Reset: How to Reset & Clear Error Codes
Most searched Rinnai water heater codes
| Code | Meaning |
|---|---|
| 10 | Air supply or exhaust blockage — on SENSEI condensing models the same code also reports a full condensate trap |
| 11 | No ignition — the heater ran its ignition sequence and no flame was established, so it shut down and flashed 11 on the temperature controller |
| 12 | Flame failure — the burner lit, then the flame was lost during operation and the heater shut down |
| 17 | Venturi blockage — debris is obstructing the venturi on the gas valve/fan assembly (SENSEI and SENSEI RX/CX only) |
| LC | Scale build-up in the heat exchanger — the heat exchanger must be flushed; LC0–LC9 count how many 70-hour temporary resets have been used without a flush |