If trouble occurs with the “+” button, note that the system always starts at high speed. To verify proper operation, press the “-” button and the blower speed will decrease. Then press the “+” button and the speed should increase.
If this is a problem other than the one mentioned above, your keypad may be defective. Often, a moisture issue in the electronic system occurs after a wet cloth has rested on the keypad or a crack in the keypad label occurs. Contact your distributor so that the keypad is changed.