Before diving into the manual specifics, it is crucial to understand the device. The SB655C is a microprocessor-based controller designed specifically for refrigeration units. It is widely used in supermarket display cases, walk-in coolers, and blast freezers.

Its primary function is to manage the temperature of the cabinet by controlling the compressor, the defrost cycles, and the evaporator fans. It belongs to the "BlueLine" family of controllers, known for their reliability and versatility. The "SB" designation usually indicates a specific form factor and terminal block arrangement that is standard in the industry.

Room probe failure. The sensor may be disconnected or faulty. E2: Evaporator probe failure.

: Supports Scroll, Semi-Hermetic, and Screw compressors with up to 4 power steps.

Has the unit recently undergone or a power surge?