Water Heater
AO Smith Water Heater error codes
12 codes across 1 model family. Start with your model number, because AO Smith reuses the same numbers for different faults on different boards.
Find your model family
The model number is on the data plate, usually on the side or back of the unit or behind the service panel. It usually starts with the letters or numbers in the name below.
310 series condensing tankless
AO Smith 310 series condensing tankless gas water heater codes
12 codes
Sealed combustion condensing unit available as direct vent, indoor and outdoor versions. The same two-digit fault numbers apply across the versions, and the fault appears on the control board LED and on the remote controller when one is fitted.
Open the 310 series condensing tankless code list →