Ensure the control cord is properly connected to the warming product module. Check to confirm the power cord is securely connected to the wall outlet. Be certain to switch the control to "On".
Dual controls frequently get switched and may be trying to operate the opposite side of the heated blanket. The control with the service label is the primary control. The primary control operates the right side of the bed when viewing the bed from the foot. If you have a remote control, it will be labeled to indicate whether it operates the left or right side of the bed. Please refer to your User Manual to confirm you have set this up correctly for your model as some models have slightly different requirements.