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Error code reference

Rheem Water Heater Error Codes

13 error codes documented with diagnostic procedures.

Have your model number? Get codes specific to your unit.
05Air intake or vent exhaust opening may be blocked.11The vent pipes on the vent termination may not be connected properly.12Gas shut-off valve is not fully opened, gas service has been interrupted, or LP gas is…13Persistent error after taking standard reset steps (error code 12 related).14Water heater is overheating.15The heat exchanger is too hot.1LWater heater has buildup of lime deposits.31Faulty inlet thermistor.33Faulty outlet thermistor.61Faulty blower motor.65Faulty water flow solenoid.99Faulty blower motor.P1Not enough water flow to operate the unit.

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Step-by-step tests, expected values, wiring diagram references, and verified part numbers.

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Common questions

How do I find the error code on my Rheem Water Heater?
Most Rheem water heaters show the code directly on the control panel display. If your model has no display, it can be read by entering diagnostic mode with the key sequence for your model. The full procedures include model-specific instructions for reading codes.
Are these codes specific to my model?
The codes here apply broadly to Rheem water heaters. Meanings and diagnostic steps can vary by model and production year, so enter your model number for model-specific information and procedures.
What do I do if my code is not listed?
Some codes are model-specific or only appear in diagnostic mode. Enter your model number to get codes specific to your unit, or contact us. We update the database continuously from manufacturer service documentation.
How much does it cost to access the full diagnostic procedures?
A 3-day pass is $9.95 one-time and gives full access to all brands, codes, and procedures. Monthly access is $29/month with unlimited access to everything including Max AI diagnostics.