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Navien water heater error E004
False flame detection. The control sees a flame when there shouldn't be one.
Serious · needs a technician
E004
Meaning: False flame detection
What causes E004
The control sees a flame when there shouldn't be one.
What to do
A technician must check the flame rod and gas valve.
Can I fix it myself?
No. This is a fault a technician should handle; keep using the appliance and it can get worse or become unsafe.
If the code comes back
Book a visit and add the code to the booking. A technician arrives knowing which parts to bring, diagnoses the water heater for a flat $89 and gives you an exact quote before doing any work.
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