Abstract: A control unit is provided for use on a gas appliance. The control unit includes an urged member and a rotor, the rotor being attached to a user input device and being rotatable to a plurality of positions, the plurality of positions including a number of positions that correspond to a number of simmer settings of a gas valve. The rotor has a plurality of engagement features, each of which corresponds to one of the simmer settings, the urged member being engaged with one of the engagement features when the rotor is in one of the simmer settings. The rotation of the rotor requires a first smaller force to be applied when the rotor is in a position other than one of the simmer settings, and rotation of the rotor requires a second larger force to be applied when the urged member is engaged with one of the engagement features.