The Bosch 12011015 Dishwasher Heat Pump circulates wash water and supports water heating to maintain suitable temperatures during dishwasher cycles. This assembly combines pumping and heating functions, moving water through the spray system while raising its temperature according to the appliance’s operating requirements. Proper performance supports effective dish cleaning, consistent water circulation, and appropriate conditions for removing food residue and grease. If the heat pump becomes faulty, the dishwasher may experience weak water flow, inadequate heating, or interrupted cycles. Replacing a defective assembly can restore normal circulation and heating functions, supporting dependable dishwasher operation.