What each Rinnai code means — and what to do next. Stuck? AAA Comfort Air fixes Rinnai systems across Central NJ, often same-day.
Rinnai tankless water heaters and boilers deliver efficient, on-demand comfort. When something is off, the unit shows a diagnostic code and a handful of common issues cover most no-hot-water calls — and we service Rinnai units across Central NJ.
Rinnai tankless units show a 2-digit code (e.g., 10, 11, 12) on the temperature controller. The indicator is a 2-digit code on the controller.
| Code | What it means | What to do |
|---|---|---|
| 10 | Blocked exhaust or air intake | Clear the vent/intake — call us |
| 11 | No ignition | Gas supply or igniter — call us |
| 12 | Flame failure (won’t stay lit) | Burner/flame sensor/gas — call us |
| 14 | Overheat / thermal fuse | Venting or flow — call us |
⚠️ Codes can vary by model and control-board revision — always confirm against the label inside your unit’s access panel. For any gas, electrical, or refrigerant fault, call a licensed technician.
Rinnai tankless units show a 2-digit code (e.g., 10, 11, 12) on the temperature controller.
You can try one power cycle at the breaker to clear a one-time fault. But if the same code returns, it’s a real fault — repeatedly resetting a gas or electrical issue can be unsafe. Call AAA Comfort Air at 609-665-3022.
AAA Comfort Air installs and repairs Rinnai systems across Cream Ridge and Central New Jersey, with same-day and 24/7 emergency service. Call 609-665-3022.
Book online or call your local Rinnai HVAC team — same-day & 24/7 emergency service.
