Vaillant Evaporator 30 kW 0020058769

The Vaillant evaporator rated at 30 kW, part number 0020058769, is the heat-absorbing coil assembly used in the outdoor unit of the VWS 300/2 heat pump. It receives low-pressure refrigerant from the expansion device and evaporates it by drawing heat from the outside air. Vaillant lists this component for service on that appliance family.

• Heating output falls short of demand, particularly in cold weather
• Frost or ice builds up on the coil and does not clear during a defrost cycle
• Refrigerant pressure or superheat readings fall outside the manufacturer's range
• Visible corrosion, mechanical damage or oil staining on the coil or its connections
• Repeated high-pressure or low-pressure faults logged by the appliance controls

• Confirm the appliance model and serial number against the manufacturer's parts list
• Check the part number 0020058769 on the unit or in the service documentation
• Work on the refrigerant circuit must be carried out by a competent, F-gas registered engineer
• Confirm the fault does not lie with another component in the refrigeration circuit before replacing the evaporator