DOES NOT come with blue jumpers! Save the jumpers off your old unit. Take pictures before removing so u can install correctly!!!

FSI, USI & WITTERN CB300, CB500, CB700 SODA VENDING MACHINE refrigeration relay. If your compressor won’t come on but if you bypass the machine and give it direct power and it comes on this is the problem. You can also check power in & out with a multi meter. This is behind the power supply door bottom right of machine near compressor.