Heatcraft Refrigeration 4313F Heater THPU32HP7Y it features high quality insulated conductors it features high quality insulated conductors and factory terminated connectors that match the original equipment specifications to prevent high resistance connections or intermittent signal loss the element is likely cracked or chemically degraded and requires replacement The heater is typically wired into the defrost termination switch or the refrigeration controller The drain line heater should be centered within the pipe and extend past the trap to ensure condensate remains in a liquid state until it reaches the floor drain