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.
Models covered: every code below applies to the Suburban NT-16SE, NT-30SP, NT-34SP.
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…
Which of these codes apply to your model?
Not every code below exists on every Suburban furnace. Pick your model number to see only the table that applies to it — and which codes it will never show.