I would take the "P" trap apart and clean it or replace it. There are some things Drano will not remove.
Easiest is to plug in the block heater cord with the hood open. Follow the cord to where the block heater is located and you should hear a gurgling sound similar to an electric kettle. If you don't check your power source. If you can reach the block heater unplug the cord from it and check the power at the end that plugs into the heater with a 2 prong tester to make sure it's not the cord causing the problem.
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