Trane MOD1803 Control Processor 318172-701 With its 13/16-inch stem length

With its 13/16-inch stem length and "flat-down" orientation

this motor fits 48 frame residential and commercial condenser units

Direct OEM Replacement: Designed specifically as the E9-251 replacement

Smith GCR30

Technicians should check for a temperature drop across the drier

Trane MOD1803 Control Processor 318172-701 With its 13/16-inch stem lengthThe Trane MOD1803 Control Processor serves as the primary Unitary Control Processor for managing HVAC system communication within specific unit ventilators and split systems. This OEM Trane replacement part is engineered for precise PID loop control, ensuring the microprocessor accurately regulates heating and cooling stagings while maintaining optimal discharge air temperatures. As a critical HVAC circuit board, the MOD1803 monitors sensor inputs and