Rheem error codes

This page lists the fault codes this brand documents, with likely causes and a short repair path. Check the model label on your unit before using any chart.

16 codes across 2 appliance types.

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Furnace 5 Tankless water heater 11

Furnace5 codes Tankless Water Heater11 codes

Rheem furnace codes

1 BlinkSoft lockout (1 hour)2 BlinksPressure switch failure (remains open)3 BlinksLimit switch open 4 BlinksPressure switch failure (remains closed)5 BlinksTwinning circuit failure

Rheem tankless water heater codes

1LLime deposit buildup 11Gas shut-off valve not fully open 12Gas service interrupted or LP gas low 14Water heater overheating 31Faulty inlet thermistor 33Faulty outlet thermistor 61Faulty blower motor 66Faulty bypass motor P1Not enough water flow 88Flush heat exchanger or replace water filter reminder 90Air intake or vent exhaust blocked