Trane Package Unit: 2/4WCC Re: Control Board Lockout / Fault Codes Red Light Status Description Control Behavior 1 Ambient Temp Sensor Out of Range Initiates a Timed Defrost every 60 min. 2 Coil Temperature Sensor Out of Range Initiates a Timed Defrost every...

Trane Package Heat Pump: 4WCC Re: Heating - Flashing Code 4 Code 4 = 4 Low Pressure Switch openings ► This is a Hard Lockout condition that must be reset by cycling power to the board. Qty Possible Causes: Low Refrigerant Charge Bad O/D Expansion Valve ...