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…