Why can't I get ANY electric heating pad to heat up past the lowest temperature setting?
Maybe. Do other appliances work OK plugged into the same outlet? Have you tried other outlets? If all three of your pads are the same model from the same company, try a different model from a different company.
DR + Mrs Bears face
Hi as it will destroy itself.
Check your ac outlet voltage. If it's less than 100 volts make the utility company fix your wiring.