Yesterday, i noticed that my thermostat was saying my BPs heat tape was 130F. I quickly turned the heat off and replaced the thermostat. I thought the thermostat was the problem. I plugged it back in and the thermostat was saying 120F. Its not lowering my temps. They keep climbing even though the thermostat isnt telling it to heat up. Its set to 87F right now. Is my heat tape dying?