Marvair 70947 Control Board 321702 401 typically requiring a Teflon washer typically requiring a Teflon washer and specific torque adjustments on the liquid line and suction manifold connections it ensures seamless integration with existing control boards and wiring harnesses without the need for field modifications Industrial Grade Durability: Constructed with high spec solid state components to withstand the high internal heat loads of telecom HVAC applications Lockouts triggered by pressure switch faults can typically be cleared by cycling the 24V control power at the thermostat or the main HACR breaker after verifying the underlying mechanical issue is resolved