Rheem-Ruud 47-17719-01 Defrost Control

If you are battling iced-up coils or mid-winter compressor short-cycling, the Rheem-Ruud 47-17719-01 Defrost Control is the specific 230V mechanical time-temperature replacement required for heritage Rheem and Ruud heat pump units. This board eliminates guesswork by integrating multiple selectable defrost intervals, allowing you to field-tune the system to 30, 45, or 90-minute cycles based on local humidity and load conditions. Designed for absolute compatibility with Rheem HVAC replacement parts, this OEM defrost control board manages the transition between heating and defrost modes by monitoring the nominal initiation temperature of 28°F and terminating the cycle once the coil reaches 55°F. The heavy-duty SPDT output form and 40A LRA rating at 230V ensure it handles the high-inductive motor loads of your outdoor fan and compressor contactor without premature relay pitting. For any veteran HVAC technician, this board is the primary solution for heat pump defrost troubleshooting when the reversing valve fails to energize or the outdoor fan stays active during a frost event.

• Field-Adjustable Intervals: Features selectable 30, 45, and 90-minute jumpers to optimize performance in varying regional climates.
• Precise Thermal Call: Fixed 28°F initiation and 55°F termination points prevent energy waste and unnecessary mechanical stress.
• High Electrical Tolerance: Rated for 240VA pilot duty and 10A FLA, providing robust switching for heat pump control systems.
• Universal Replacement: Direct OEM fit for Rheem-Ruud 47-17719-01, maintaining factory-spec timing and safety sequences.

Is this a demand-defrost or time-temperature board?
This is a time-temperature defrost control. It initiates the cycle based on the cumulative compressor run-time and a closed signal from the defrost thermostat sensor on the coil.

Will this solve my outdoor fan running during defrost?
Yes, if the board's internal relay has failed to open the fan circuit, swapping to a fresh 47-17719-01 will restore proper fan-off operation during the heat-reversal phase.

What if the sensors are bad?
Always check your defrost sensor resistance against the manufacturer’s chart before replacing the board. While this board controls the logic, a faulty sensor can lead to "false" defrost or no defrost at all.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.