Rheem · Water heater
Code 31 Inlet water filter problem
What this code means
The unit's inlet filter is restricting flow enough to trigger a fault.
Most likely causes
- Sediment or debris clogging the inlet filter screen
What to try first
Shut off the water supply, remove the inlet filter (usually behind a small cap on the cold inlet), and rinse it clean.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
Find the part on Amazon →FAQ
What does Rheem error code Code 31 mean?
Inlet water filter problem. The unit's inlet filter is restricting flow enough to trigger a fault.
Can I fix Rheem code Code 31 myself?
Often, yes. Shut off the water supply, remove the inlet filter (usually behind a small cap on the cold inlet), and rinse it clean.
What causes Rheem code Code 31?
The most common causes are: sediment or debris clogging the inlet filter screen.
Other Rheem water heater codes
All Rheem 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.