What each Navien code means — and what to do next. Stuck? AAA Comfort Air fixes Navien systems across Central NJ, often same-day.
Navien is a leader in high-efficiency condensing tankless water heaters and combi-boilers. When something is off, the unit shows an E-code on the front panel.
Navien tankless units show an E-code (e.g., E003) on the front display and control panel. The indicator is a E-code on the front display / control panel.
| Code | What it means | What to do |
|---|---|---|
| E003 | Ignition failure (burner did not light) | Check gas supply; clean ignition — call us |
| E012 | Flame loss / low water flow | Clean the inlet filter; check gas & venting — call us |
| E016 | Heat exchanger overheating | Flush the unit; clean the cold-water filter — 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.
Navien tankless units show an E-code (e.g., E003) on the front display and control panel.
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 Navien 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 Navien HVAC team — same-day & 24/7 emergency service.
