Suburban SW6D / SW10D fault codes

The 4 fault codes below are the ones that apply to this Suburban water heater family. The other 3 Suburban water heater codes in our database belong to different model families — they are listed further down so you do not troubleshoot against the wrong table.

Covered model numbers

SW6DSW10D

Not on the list? Check the rating label before you troubleshoot — the code table below will not apply. Where to find it →

Fault codes on the Suburban SW6D / SW10D

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…

Codes that do not apply to this model

These 3 codes exist on other Suburban water heaters. If your unit is showing one of them, it is not from this family — re-check the model number on the label before acting on any of these.

DSI lockout
Suburban gas (DSI) water heaters do not show a numeric fault code. When you flip the LP sw… Electric ECO tripped
On gas/electric (DE) models, the 120V electric heating circuit has its own high-limit/ECO.… Electric element no heat
On gas/electric models, the 120V element produces no heat or water is not hot enough. The …

Where the model number is

On the data plate behind the outside access door, next to the burner tube — bring a torch, it is often sooted over.

Sources

All Suburban water heater fault codes →
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