Rheem Water Heaters Error Codes
40 error codes extracted from Rheem water heaters service manuals. Each code includes its meaning and a summary fix step.
Error Codes40 codes
Thermopile Voltage Low
Check thermopile connector to the combination gas control (thermostat) to ensure it is properly connected.
High Water Temperature Limit Tripped
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
Water Temperature Sensor Failure
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
Combination Gas Control (Thermostat) Failure
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
False Pilot Flame Signal
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
Chamber Sensor Failure or Bimetal Switch Activated
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
Chamber Temperature Shutdown
Contact a qualified service technician. See 'IF YOU NEED SERVICE' on page 28.
Pilot recently extinguished and Thermopile is cooling down, or Temperature knob recently turned to OFF position.
Follow the lighting instructions as detailed on this water heater and its Use & Care manual to light the pilot.
Water heater has buildup of lime deposits.
Contact a dealer or qualified service technician.
Air intake or vent exhaust opening may be blocked.
Remove any blockage. (Air intake requires 12 in. [30 cm] of clearance.)
The vent pipes on the vent termination may not be connected properly.
Contact a dealer or qualified service technician.
The gas shut-off valve is not fully opened.
Check shut-off valve and open completely.
If this code is still displayed after taking the numbered steps above.
Contact a dealer or qualified service technician.
Water heater is overheating.
Contact a dealer or qualified service technician.
The heat exchanger is too hot.
Check for blockage in the vent. Contact a dealer or qualified service technician.
Neutralizer is clogged.
Contact a dealer or qualified service technician.
Faulty inlet thermistor.
Contact a dealer or qualified service technician.
Faulty outlet thermistor.
Contact a dealer or qualified service technician.
Faulty blower motor.
Contact a dealer or qualified service technician.
Faulty water flow solenoid.
Contact a dealer or qualified service technician.
The neutralizer needs to be replaced soon.
The unit can be used for a while, but contact a dealer or qualified service technician.
The neutralizer must be replaced.
The unit cannot be used until the neutralizer is replaced. Contact a dealer or qualified service technician.
Not enough water flow to operate the unit.
Increase the water flow from the fixtures.
Reminder of flushing the heat exchanger and/or replacing the water treatment filter.
Contact a dealer or qualified service technician.
Configuration data restore failure
Call for service
1. Disconnection of lower thermistor. 2. Failure of lower thermistor.
Please call for service
Tank not filled with water
Please fill the tank with water and recycle power
1. Disconnection of wire(s) to upper or lower element or ECO. 2. Upper element wire(s) and lower element wire(s) switched. 3. ECO tripped and needs reset. 4. Failure of one or both elements.
Call for service; Reset ECO or call for service
1. Upper or lower element relay stuck on. 2. Upper or lower temperature conversion error. 3. Conversions stuck error. 4. Conversion drift error. 5. On-board temperature protection error. 6. Failure or disconnection of upper thermistor.
Please call customer service
Control Off/Pilot Out
Follow the operating instructions in the Use & Care Manual to turn on the Combination Gas Control; Follow the lighting i...
Normal Operation
Set temperature knob on Combination Gas Control to desire setting
Thermopile Voltage Low
Check thermopile connector to the Combination Gas Control to ensure it is properly connected; Check thermopile wires for...
High Temperature Shutdown
Contact a qualified service technician. See "IF YOU NEED SERVICE" on page 28
Temperature Sensor Failure
Contact a qualified service technician. See "IF YOU NEED SERVICE" on page 28
Gas Control or Valve Failure
Contact a qualified service technician. See "IF YOU NEED SERVICE" on page 28
Flame Sense Error
Contact a qualified service technician. See "IF YOU NEED SERVICE" on page 28
Flue Temp Sensor Open
Check Wiring
Chamber Sensor Failure
Contact a qualified service technician.
Chamber Temperature Shutdown
Contact a qualified service technician.
Pilot not lit
Follow the lighting instructions as detailed on this water heater and its Use & Care manual to light the pilot.
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