The York 025-37853-000 Crankcase Heater is a critical 120V

If the high-limit switch fails or stays open

this is an Open Dripproof (ODP) motor designed for Air Over (AO) applications

these codes often point toward a failure in the output thermistor circuit

Tecumseh K90-04 Overload Kit R-448A The York 025-37853-000 Crankcase HeaterThe Tecumseh K90 04 Overload Kit is a critical external protection component engineered for HVAC compressor troubleshooting and preventative maintenance. Designed specifically for high torque applications, this Tecumseh compressor overload protects the motor windings from overcurrent conditions and thermal spikes that lead to premature failure. This OEM replacement part ensures precise trip curves that match original factory specifications,