40 amp relay for PowerUP (located inside the junction box) Easy to replace: The video below provides simple instructions for changing the relay. Cost-effective repair solution: Relays are a consumable due to the number of times they are required to operate however, unlike some of our competitor reels the relay can be simply and cheaply changed as opposed to replacing expensive control units. For help with installing, troubleshooting or maintaining your PowerUP window cleaning system, take a look at our manual and view our maintenance videos below.