@DeadNewbie You may have set an active temperature in DWC, but the bed heater may not have activated. It usually activates as soon as you set an Active temperature, either by selecting from the drop down list or typing in a value. You can see if the Heater is active, in standby or off by looking under the Heater name, eg in image below, Heater 1 is active (though no temperature set) Heater 0 is off. Clicking on the Heater name should cycle through the three options, too.
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Ian