73 20901101_EN_PC5xx-6xx_VARIO_select_Serie_V1.0_280618Cleaning and maintenance7.3.4 Change device fuseAt the power connection on the rear side of the pumping unit,there are 2 device fuses, type: 6,3 A/t – 5x20.Change device fuse1 21. Unplug the power plug. 2. Carefully pull out the fuseholder.3 43. Replace the fuses. 4. Push the fuse holder back ontothe fuse socket.