A method for commissioning a gas valve assembly for controlling fuel flow to a combustion appliance, the gas valve assembly including a valve body with an inlet port and an outlet port, and a fluid path extending between the inlet port and the outlet port, the gas valve assembly further including at least one valve situated in the fluid path between the inlet port and the outlet port, the gas valve assembly further including a controller secured relative to the valve body and in communication with the at least one valve, the controller configured to move the at least one valve between an open configuration, a closed configuration, and a plurality of intermediate configurations therebetween to control a flow of gas to a gas burner of the combustion appliance, the method comprising: initiating, by an external device via a wireless or wired connection, a commissioning wizard that guides a user in inputting, activating, setting, running, and saving steps by showing and hiding actions that are permitted and banned at a given commissioning state; relaying to the controller of the gas valve assembly, by the external device, a command to enter a commissioning mode; once in the commissioning mode, using a wizard screen in the external device: inputting a user defined initial air to fuel (A/F) ratio; activating the gas burner of the combustion appliance; setting a burner load of the combustion appliance to a set burner load; inputting a desired A/F ratio for the set burner load; running the combustion appliance at the burner load with the desired A/F ratio, and observing the operation of the combustion appliance; saving the desired A/F ratio for the set burner load to the controller of the gas valve assembly; and exiting the commissioning mode. initiating, by an external device via a wireless or wired connection, a commissioning wizard that guides a user in inputting, activating, setting, running, and saving steps by showing and hiding actions that are permitted and banned at a given commissioning state; relaying to the controller of the gas valve assembly, by the external device, a command to enter a commissioning mode; once in the commissioning mode, using a wizard screen in the external device: inputting a user defined initial air to fuel (A/F) ratio; activating the gas burner of the combustion appliance; setting a burner load of the combustion appliance to a set burner load; inputting a desired A/F ratio for the set burner load; running the combustion appliance at the burner load with the desired A/F ratio, and observing the operation of the combustion appliance; saving the desired A/F ratio for the set burner load to the controller of the gas valve assembly; and exiting the commissioning mode. inputting a user defined initial air to fuel (A/F) ratio; activating the gas burner of the combustion appliance; setting a burner load of the combustion appliance to a set burner load; inputting a desired A/F ratio for the set burner load; running the combustion appliance at the burner load with the desired A/F ratio, and observing the operation of the combustion appliance; saving the desired A/F ratio for the set burner load to the controller of the gas valve assembly; and exiting the commissioning mode.