Navien
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⛔ Do Not Use
Navien - Error Code E002
Navien Water Heater error code E002: Abnormal flame — burner shut off mid-operation.
Is it safe?
⛔ No — stop using
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Can I fix it?
Technician Required
Repair cost
Pro: $150–$600
⏱ 1–3 hours (pro)
What Does Error Code E002 Mean?
Navien Water Heater error code E002: Abnormal flame — burner shut off mid-operation.
Part that typically fails: Gas valve / igniter / heat exchanger
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Symptoms You May Notice
- ⚠️ No hot water
- ⚠️ Unit clicking but not firing
- ⚠️ Cold water only
What the Technician Will Do
🔧 Professional repair required. Do not attempt DIY — this repair requires specialized tools or certification.
- 1 Check your owner's manual for model-specific guidance on error code reset procedures
- 2 Check that gas supply valve is fully open and gas supply pressure is adequate
- 3 Clean the flame sensor rod with fine steel wool — carbon buildup is the #1 cause
- 4 Ensure the venting (exhaust and air intake pipes) are clear of obstructions, ice, or debris
- 5 If the error persists after reset and basic checks, contact a qualified technician
⚡ Quick tip: Always try a full power reset first — turn the unit off at the breaker, wait 30 seconds, restore power.
Frequently Asked Questions
What does Navien Water Heater error code E002 mean? ▼
Error code E002 on a Navien tankless water heater indicates: Abnormal flame — burner shut off mid-operation. The unit has detected this condition and has limited or stopped operation to prevent further damage.
How do I fix Navien Water Heater error code E002? ▼
Start by powering the unit off for 30 seconds and restarting. If error E002 returns, the underlying cause (abnormal flame — burner shut off mid-operation) needs to be addressed. Check wiring connections and filters first before replacing components.
Is Navien error code E002 serious? ▼
It depends on the root cause. Some E002 errors resolve with a reset. Others indicate a failed component that requires professional repair. Don't continue operating with this error — it can lead to further damage.