Rheem furnace codes

A furnace reports faults on a small status LED on the control board, seen through the sight glass in the blower door, or on a two-digit display. Watch a full cycle of the pattern and count the flashes, including the pause between groups, before you decide what you saw. The code chart is on the label inside the blower door.

All 5 codes

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

About Rheem 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.