Rheem digital water heaters utilize specific error codes flashed on control boards or digital panels to diagnose operational issues. Common codes include Code A104 or flashing red lights indicating ignition failure on gas models, Code C1 denoting a blocked exhaust vent or pressure switch failure, and sensor faults corresponding to thermistor errors. On electric models, error codes often highlight dry-firing or upper/lower thermostat element communication faults. When an error code appears, homeowners should cross-reference the exact alphanumeric sequence with the user manual legend on the side of the tank and perform a safe power reset before calling a licensed technician.
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