Slight boiling noise aside, a loud and unbearable rattling noise plagued my B&D Hot and Cold Water Cooler (top load). DIY Solution: The issue was some sort of copper coil vibrating against the front panel cover (just behind where you would place a glass. This copper colored coil is attached a canister looking thingy ma-bob, with a long black arm that is runs to the bottom right of the back cover. By removing all four screws on the back cover, you may angle (bottom out) the cover enough to gain access to this arm. GENTLY... lift the arm/rod so that the copper coil is no longer touching the front panel (and thus it is free to vibrate without that annoying noise). CAUTION: unplug the unit and ground yourself to avoid shock. Once you can see the coil is no longer touching, plug-er back in and see if the noise has stopped. Perform above at own risk.!!!!!
SOURCE: advise
you need to purge the air out of the "hot" side after placing the bottle on top. If not enough water is inside the chamber the water will boil.
SOURCE: Our Hamilton beach water cooler makes a constant
When empty of water remove the back panel and the cooling fins are most likely covered with an inch of dirt! Find an air compressor and blow out the dirt. It worked on mine!
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