Warm grease is liquid; when it hits the cold water in the tank, it solidifies into a hard, waxy cap that coats the float switches (preventing them from activating) and seals the discharge pipe.
If the blockage is suspected to be limescale: blocked saniflo
A occurs when something prevents either the maceration (cutting) or the pumping (expulsion) from completing. Warm grease is liquid; when it hits the