Suburban RV water heater fault codes
RV water heaters (gas, electric or both) commonly lock out when the burner fails to light. Some boards flash a status light; others simply stop and require a reset.
How to read the code
Confirm whether you are on gas or electric, check for a tripped reset, and note any status-light pattern before resetting power.
Models covered: every code below applies to the Suburban SW6DE, SW6DEL, SW10DE, SW10DEL, SW12DE, SW16DE.
All documented codes
DSI lockout warning
Suburban gas (DSI) water heaters do not show a numeric fault code. When you flip the LP sw… Electric ECO tripped warning
On gas/electric (DE) models, the 120V electric heating circuit has its own high-limit/ECO.… Electric element no heat warning
On gas/electric models, the 120V element produces no heat or water is not hot enough. The … Gas ECO tripped warning
The gas-side ECO (Energy/Electric Cut Off, a high-limit thermostat) on the 12V DC gas circ… Gas valve won't open warning
The board is sequencing and spark is present, but the gas valve fails to open so no fuel r… No reset light warning
On a DSI SW-series unit, the reset light failing to come on at all when the switch is turn… No spark / no ignition warning
The control board is powered and attempting to light (reset light cycling) but no spark is…
Suburban gas (DSI) water heaters do not show a numeric fault code. When you flip the LP sw… Electric ECO tripped warning
On gas/electric (DE) models, the 120V electric heating circuit has its own high-limit/ECO.… Electric element no heat warning
On gas/electric models, the 120V element produces no heat or water is not hot enough. The … Gas ECO tripped warning
The gas-side ECO (Energy/Electric Cut Off, a high-limit thermostat) on the 12V DC gas circ… Gas valve won't open warning
The board is sequencing and spark is present, but the gas valve fails to open so no fuel r… No reset light warning
On a DSI SW-series unit, the reset light failing to come on at all when the switch is turn… No spark / no ignition warning
The control board is powered and attempting to light (reset light cycling) but no spark is…
Which of these codes apply to your model?
Not every code below exists on every Suburban water heater. Pick your model number to see only the table that applies to it — and which codes it will never show.