Rheem · Water heater
Code 29 Condensate neutralizer fault
What this code means
Specific to condensing tankless models — the neutralizer that treats acidic condensate needs attention.
Most likely causes
- Neutralizer media depleted and needs replacement
- Condensate line clogged or blocked
What to try first
Neutralizer cartridges are a scheduled-maintenance item; check your manual for the replacement interval.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
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What does Rheem error code Code 29 mean?
Condensate neutralizer fault. Specific to condensing tankless models — the neutralizer that treats acidic condensate needs attention.
Can I fix Rheem code Code 29 myself?
Often, yes. Neutralizer cartridges are a scheduled-maintenance item; check your manual for the replacement interval.
What causes Rheem code Code 29?
The most common causes are: neutralizer media depleted and needs replacement; condensate line clogged or blocked.
Other Rheem water heater codes
All Rheem water heater error codes →
Other water heater brands: Ruud · Rinnai · Navien · Noritz · Takagi · A.O. Smith · Bradford White · State / American · Generic electric · Generic tankless
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.