Brand guide
Rheem Error Codes: Meanings & Safe Checks
Match the equipment family and displayed code before following any check.
Rheem water heater 11 means The gas shut-off valve is not fully opened, or gas service has been interrupted.
Rheem water heater 12 means LP gas is running low (LP models only). See the verified model scope, safe checks, and official source.
Rheem water heater 14 means Water heater is overheating. See the verified model scope, safe checks, and official source.
Rheem water heater 1L means Water heater has buildup of lime deposits. See the verified model scope, safe checks, and official source.
Rheem water heater 29 means Neutralizer is clogged. See the verified model scope, safe checks, and official source.
Rheem water heater 31 means Faulty inlet thermistor. See the verified model scope, safe checks, and official source.
Rheem water heater 33 means Faulty outlet thermistor. See the verified model scope, safe checks, and official source.
Rheem water heater 61 means Faulty blower motor. See the verified model scope, safe checks, and official source.
Rheem water heater 66 means Faulty bypass motor. See the verified model scope, safe checks, and official source.
Rheem water heater 71 means Solenoid valve circuit failure. See the verified model scope, safe checks, and official source.
Rheem water heater 88 means Reminder of flushing the heat exchanger and/or replacing the water treatment filter.
Rheem water heater 90 means Air intake or vent exhaust opening may be blocked; or the vent pipes on the vent termination may not be connected properly.
Rheem water heater P1 means Not enough water flow to operate the unit. See the verified model scope, safe checks, and official source.