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Gas valve fault: tankless water heater / continuous flow hot water system codes by brand
A gas valve, solenoid or gas/air mixing (venturi) control is not responding correctly.
| Brand | Code | Meaning | What you can do |
|---|---|---|---|
| Rinnai | 15 | Venturi control failure | Safe checks first, then a pro |
| Rinnai | 17 | Venturi blockage | Safe checks first, then a pro |
| Rinnai | 18 | Gas valve adjustment limit | Call a pro |
| Rinnai | 22 | Gas valve adjustment fault | Call a pro |
| Rinnai | 52 | Gas modulating valve fault | Call a pro |
| Rinnai | 71 | Gas solenoid valve failure | Call a pro |
| Navien | E056 | Modulating gas valve fault | Call a pro |
| Navien | E060 | Dual venturi fault | Call a pro |