Rheem Water Heater Error Code 13

Error code 13 on a Rheem water heater means the unit has experienced a persistent ignition or flame failure that could not be resolved through the standard reset procedure for error code 12. The heater has entered a lockout state to prevent repeated unsafe ignition attempts. This code indicates the problem requires diagnosis and repair by a qualified service technician.

No, the unit should not be operated while displaying error code 13. The heater has locked out due to repeated ignition failures, meaning it is not producing hot water and may attempt unsafe ignition cycles if reset without addressing the root cause. Leave the unit off and contact a technician promptly.

Repair costs vary depending on which component has failed and local labor rates. Flame sensor or igniter replacements tend to be on the lower end of the cost range, while gas valve or control board replacements can cost significantly more including parts and labor. Expect diagnostic service calls alone to range from $75 to $150 or more before parts and repair costs are added.

Error code 13 is specifically triggered when standard reset steps have already failed to resolve the underlying fault. Rheem recommends contacting a licensed dealer or qualified technician at this point rather than attempting further resets or DIY repairs. Working on gas components without proper training and tools can create serious safety hazards.

A simple reset is unlikely to clear error code 13 because this code only appears after reset attempts for the related error code 12 have already failed. The fault is persistent by definition, and the root cause must be diagnosed and repaired before the error will clear. A technician will need to inspect the igniter, flame sensor, gas valve, and control board.