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. <EOS>