After a week using it, the temp button(+) on the main unit was not working, and also the main unit was making noise louder than before. So I decided to disassemble the unit cause I like this product already. I found that the control pad(touch pad) was not assembled correctly- the spring on the touchpad was not where it should be and one of the power lines stuck with the motor so it made noise. I fixed a few things then the pad works well. Hope the seller read this review and pay more attention on the assembly process