Code index · 14 entries
Rheem furnace error codes
14 codes from the Rheem furnace manual. Select a code for causes, safe checks and when to call a pro. View the source manual (PDF).
One-hour lockout, caused by repeated failed ignition (11), water sensed (59), dead blower (61), internal fault (93), flame lost 5 times (13) or unexpected flame (14).
Failed ignition. After four failed attempts the control enters one-hour lockout (10).
Low flame sense: flame sense current is weak or marginal. Furnace keeps running.
Flame lost after established.
Flame present with gas valve off. Extremely critical; furnace will not operate.
Open fuse, usually from a 24 VAC short to common or ground.
Over-temperature (rollout) switch open: flames rolled out of the heat exchanger into the burner compartment.
Low pressure switch closed with inducer off.
Low pressure switch open with inducer on high speed.
Low pressure switch open with inducer on low speed.
High pressure switch open with inducer on high speed; furnace may drop to low fire.
Water sensed in the collector box; gas heat will not run.
Blower fault, blower can still run: blower at max speed/torque or temperature limit because static pressure is too high.
Blower fault, motor cannot run. Furnace will not operate in any mode.