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Moisture or droplets of water on the inner base of your appliance are usually associated with a blocked gutter outlet on the rear inner wall; they could also be caused by items touching the back wall of the appliance.
We recommend you clear any obstruction from the gutter outlet using a drinking straw or pipe cleaner for example then mop up the water on the base and this should cure the problem. Please see user manual for more information.
If you need further assistance please call Hotpoint customer service on 0344 822 4224.