Noritz · Water heater
Code 63 Recirculation pump abnormality
What this code means
The built-in recirculation pump isn't behaving as the control board expects — a distinct component from Code 61's combustion fan.
Most likely causes
- Failing recirculation pump motor
- Wiring harness fault at the component
What to try first
Power-cycle once; a recurring code points to the recirculation pump needing replacement.
Safety note: if this code returns after one clean reset, stop resetting it — repeated lockouts usually mean a real fault that needs a licensed technician. Never bypass a safety switch.
FAQ
What does Noritz error code Code 63 mean?
Recirculation pump abnormality. The built-in recirculation pump isn't behaving as the control board expects — a distinct component from Code 61's combustion fan.
Can I fix Noritz code Code 63 myself?
Usually not. Power-cycle once; a recurring code points to the recirculation pump needing replacement. If the code returns after one reset, it needs a licensed technician.
What causes Noritz code Code 63?
The most common causes are: failing recirculation pump motor; wiring harness fault at the component.
Other Noritz water heater codes
All Noritz water heater error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.