Atwood RV furnace fault codes
RV forced-air propane furnaces lock out after failed ignition attempts. Many use a status LED on the control board that flashes a fault pattern.
How to read the code
Find the control board (often behind an exterior access panel or inside under a vent) and watch the status LED. Count the flashes in each group; the pattern maps to a specific fault.
All documented codes
1 flash warning
One LED flash followed by a 3-second pause, repeating. Indicates a limit switch / airflow … 2 flashes danger
Two LED flashes followed by a 3-second pause, repeating. Indicates a flame sense fault: th… 3 flashes warning
Three LED flashes followed by a 3-second pause, repeating. Indicates an ignition lockout f… 4 flashes warning
On a 2-stage Excalibur furnace control board, four flashes of the diagnostic LED report a … 5 flashes warning
On a 2-stage Excalibur furnace control board, five flashes indicate a module (control boar… Steady on (no flash) danger
The diagnostic LED on the ignition control board is on continuously with no flashing, indi…
One LED flash followed by a 3-second pause, repeating. Indicates a limit switch / airflow … 2 flashes danger
Two LED flashes followed by a 3-second pause, repeating. Indicates a flame sense fault: th… 3 flashes warning
Three LED flashes followed by a 3-second pause, repeating. Indicates an ignition lockout f… 4 flashes warning
On a 2-stage Excalibur furnace control board, four flashes of the diagnostic LED report a … 5 flashes warning
On a 2-stage Excalibur furnace control board, five flashes indicate a module (control boar… Steady on (no flash) danger
The diagnostic LED on the ignition control board is on continuously with no flashing, indi…
Which of these codes apply to your model?
Not every code below exists on every Atwood furnace. Pick your model number to see only the table that applies to it — and which codes it will never show.