For technicians servicing older electric heat strips or residential fan coils

this board provides the necessary interface for hydronic system troubleshooting

featuring identical port sizes and wiring configurations

When performing a furnace electrode replacement

This cartridge belongs to the Type Q series

York S1-331-03655-000 Temp Sensor 320788-702 For technicians servicing older electricThe York S1 331 03655 000 Outdoor Return Temperature Sensor is a critical OEM HVAC component specifically engineered for high performance York outdoor units. As a precision thermistor assembly, this sensor provides the control board with real time return air temperature data, essential for maintaining proper logic in heating and cooling cycles. Field technicians recognize that accurate feedback is vital for preventing short cycling and ensuring