If the switch is open while the furnace is cool

What does the "potted" designation mean for this control

Technicians should look for inconsistent blower operation

the Trane MOT13934 requires a specific wiring harness and a variable speed control board compatible with ECM signals

Nordyne 669578R TXV 320788-702 If the switch is openThe Nordyne 669578R is a high performance 5 Ton R410A TXV designed to provide precise refrigerant metering for residential and light commercial air conditioning systems. Engineered for N Series evaporator coils, this TR6 Thermal Expansion Valve maintains optimal superheat across varying load conditions, preventing compressor liquid slugging while maximizing evaporator coil efficiency. As an OEM Nordyne replacement part, it ensures seamless