Rheem Ruud 47 102684 204 Control Board Kit Els PW 17895 the materials used in this the materials used in this Emerson Alco solenoid valve are compatible with both mineral and POE lubricants found in modern refrigeration systems Thermal Resistance: High grade material survives high cycling combustion temperatures without degradation or leakage Complete Field Kit: Includes the 47 102684 204 control board and compatible sensors to ensure a comprehensive repair and proper communication between the coil and board When you are troubleshooting a heat pump that refuses to initiate its defrost cycle or is experiencing excessive ice buildup on the outdoor coil