This like new powerful 1/2” Milwaukee 5380-21 corded hammer drill rarely will turn on.  When it does, it seems full power....

One cup of vinegar with one cup water is enough to clean. Just run it thru several times before the final clean water run thru rinse.

Probably the thermo cut-off device is stuck in "open" condition a safety component used to prevent over heating and potential fire. It's in the internal wiring to monitor the temperature where the water is brought up to boiling. It triggers every time as you finish brewing, to cut the flow of electricity to the heating coil. It now must be replaced which an experienced do-it-yourselfer can do, but you must find the right temperature "thermo-disc" (usually rated to open at about 220F/105C) to wire in. Unfortunately I've never seen one with a simple plugin feature. This is NOT an uncommon problem as a coffeemaker ages.