Suburban 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
High-limit lockout warning
The high-temperature limit switch is a normally-closed safety in series with the ignition … Ignition lockout warning
Suburban NT and SF series RV furnaces do not display a numeric error code or LED blink cod… Low-voltage standby info
The Fan Control module board continuously monitors supply voltage. On the 12 VDC board it … Sail switch lockout warning
On the 12 VDC Fan Control module board, after the thermostat calls for heat the board firs…
The high-temperature limit switch is a normally-closed safety in series with the ignition … Ignition lockout warning
Suburban NT and SF series RV furnaces do not display a numeric error code or LED blink cod… Low-voltage standby info
The Fan Control module board continuously monitors supply voltage. On the 12 VDC board it … Sail switch lockout warning
On the 12 VDC Fan Control module board, after the thermostat calls for heat the board firs…