Atwood 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.
All documented codes
DSI Fault / Lock-Out warning
On Atwood DSI (Direct Spark Ignition) water heaters there is no multi-digit numeric code. … ECO open / tripped warning
The ECO is a backup high-limit temperature switch wired in series with the control. On DSI… Gas & spark, no flame proven warning
A diagnostic sub-condition of the DSI lock-out: both gas and spark are present but the fla… Gas present, no spark warning
A diagnostic sub-condition of the DSI lock-out from the official trouble-shooting guide: g… No spark / no ignition danger
Dead unit with no spark at the electrode and no lockout-light activity, typically caused b… Spark present, no gas warning
A diagnostic sub-condition of the DSI lock-out from the official trouble-shooting guide: t… TCO (thermal cut-off) tripped danger
Current Atwood DSI water heaters have a one-shot thermal cut-off device on the incoming po…
On Atwood DSI (Direct Spark Ignition) water heaters there is no multi-digit numeric code. … ECO open / tripped warning
The ECO is a backup high-limit temperature switch wired in series with the control. On DSI… Gas & spark, no flame proven warning
A diagnostic sub-condition of the DSI lock-out: both gas and spark are present but the fla… Gas present, no spark warning
A diagnostic sub-condition of the DSI lock-out from the official trouble-shooting guide: g… No spark / no ignition danger
Dead unit with no spark at the electrode and no lockout-light activity, typically caused b… Spark present, no gas warning
A diagnostic sub-condition of the DSI lock-out from the official trouble-shooting guide: t… TCO (thermal cut-off) tripped danger
Current Atwood DSI water heaters have a one-shot thermal cut-off device on the incoming po…