Rinnai Tankless Water Heater Error Codes
30 diagnostic codes, 21 model families documented.
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Model Families
| Family | Name | Fuel | Models |
| CU | Rinnai CU Series Commercial Condensing | gas | 1 |
| HE | HE-50E | dual_fuel | 1 |
| HE++ Series | HE++50 | gas | 2 |
| I-SERIES | Rinnai I-Series Plus Condensing Boiler | gas | 1 |
| NCB | NCB-240 | gas | 6 |
| NPE | NPE-184 | gas | 5 |
| RE | Rinnai RE Series Non-Condensing Tankless | gas | 1 |
| REP | Rinnai REP Non-Condensing with Built-in Pump | gas | 1 |
| RL | RL-94i | gas | 1 |
| RU | Rinnai RU Series Super High Efficiency Plus Condensing | gas | 1 |
| RUCS | Rinnai RUCS Condensing Compact Tankless | gas | 1 |
| RX | Rinnai SENSEI RX Condensing Tankless | gas | 1 |
| RXP | Rinnai SENSEI RXP Condensing with Built-in Pump | gas | 1 |
| Rinnai NCB Series | NCB-180E, NCB-199E, NCB-211E, NCB-240E | gas | 1 |
| Rinnai NPE Series | NPE-180E, NPE-199E, NPE-211E, NPE-240E | gas | 1 |
| Rinnai R Series | RIN-160E | gas | 1 |
| Rinnai RL Series | RL94iN | natural_gas | 1 |
| Rinnai RU Series | RU98iN | natural_gas | 1 |
| Rinnai RUR Series | RUR-180E, RUR-199E, RUR-211E, RUR-240E | gas | 1 |
| Rinnai VSP | VSP-185E | gas | 1 |
| V | Rinnai V Series Legacy Non-Condensing Tankless | gas | 1 |