Atwood GC / GCH series fault codes

The 6 fault codes below are the ones that apply to this Atwood water heater family. The other 1 Atwood 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

GC6AA-10EGC10A-4EGCH6A-10EGCH10A-4E

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 Atwood GC / GCH series

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… 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…

Codes that do not apply to this model

These 1 codes exist on other Atwood 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.

No spark / no ignition
Dead unit with no spark at the electrode and no lockout-light activity, typically caused b…

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 Atwood water heater fault codes →
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