Rheem · Water heater
Code 52 Modulating gas valve problem
What this code means
The valve that modulates gas flow to match demand isn't responding correctly.
Most likely causes
- Faulty modulating valve
- Wiring or control board fault
What to try first
Not a DIY repair given the gas components involved.
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 Rheem error code Code 52 mean?
Modulating gas valve problem. The valve that modulates gas flow to match demand isn't responding correctly.
Can I fix Rheem code Code 52 myself?
Usually not. Not a DIY repair given the gas components involved. If the code returns after one reset, it needs a licensed technician.
What causes Rheem code Code 52?
The most common causes are: faulty modulating valve; wiring or control board fault.
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.