Rheem Tank Water Heater Error Codes: Full List & Meanings

Every Rheem tank water heater error code we have verified against Rheem's own support pages, with its official meaning. This list covers atmospheric gas water heaters with combination gas control (status light, 3-second cycle). Codes vary by model, so confirm in your owner's manual. Support: Rheem water heater support, 1-866-279-4566.

Smell gas? Leave the building now. Do not touch light switches, phones or appliances inside. Call your gas utility or 911 from outside. CO alarm sounding or headache, dizziness or nausea? Get everyone outside and call 911. Gas valves, burners, venting and wiring are for a licensed technician only. See our safety policy.

Codes by system

All Rheem tank water heater error codes

Codes marked "Reset only" or "Service" have no separate page because the manufacturer publishes no owner fix beyond a reset or a service call.

Code	Official meaning	System	Owner action
Off	Status light off: control turned off, pilot not lit or low thermopile power; follow the lighting instructions on the water heater label. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Heating	Service
Solid	Status light constantly lit: pilot recently out and thermopile cooling, or knob recently turned off; then relight per the label. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Heating	Service
1 blink	Normal operation (blue).	Status / reminder	Service
2 blinks	Low thermopile voltage with pilot lit. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Heating	Service
4 blinks	High water temperature limit tripped. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Heating	Service
5 blinks	Water temperature sensor failure. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Sensors	Service
7 blinks	Combination gas control failure. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Control / electronics	Service
8 blinks	False pilot flame signal. Service actions are for a qualified technician (Rheem 1-866-279-4566).	Heating	Service

Symptoms

Sources

https://files.myrheem.com/webpartners/ProductDocuments/1FDFD3BA-486A-4DF6-AF41-379C76B757C7.pdf (official)

Last reviewed: October 20, 2026. ErrorCodePro is not affiliated with Rheem.