Nordyne 917178A Defrost Circuit Board

Nordyne / Miller / Nortek 917178A Defrost Control Kit | OEM

The 917178A is a genuine factory-authorized defrost control board kit designed for residential split-system heat pumps. As an Original Equipment Manufacturer (OEM) part, this kit is the most current technical revision, engineered to manage the defrost cycle and protect the compressor from short-cycling.

This comprehensive kit is specifically designed to upgrade older, obsolete boards and comes with all necessary hardware for a complete field replacement.

Compatibility & Cross-Reference

The 917178A is a universal service replacement for a wide range of legacy Nordyne and manufacturer-specific control boards:

  • Directly Replaces P/Ns: 917178, 624626, 624626R, 621579, 621579R, 624608, 624633, 624644, 624656, 624519, 917012, 621301, and 624813.
  • Wide Brand Fit: Used in units branded as Nordyne, Nortek, Intertherm, Miller, Frigidaire, Gibson, Maytag, Westinghouse, Tappan, Kelvinator, GrandAire, Philco, Garrison, and Mammoth.
  • System Type: Engineered for use with residential split-system heat pumps, including T3 and T5QD series 13 SEER units.

Technical Specifications

FeatureDetail
Part Number917178A
Voltage24 VAC
Timing Delay5-Minute Anti-Short Cycle
Kit IncludesDefrost Board, Wiring, and Mounting Hardware
LogicTime-Temperature Defrost Management

Why Choose a Genuine Nortek OEM Kit?

  • Upgraded Reliability: Replaces multiple generations of older boards with a more robust circuit design that resists thermal stress and voltage spikes.
  • Integrated Compressor Protection: Includes a built-in 5-minute time delay (anti-short cycle timer) to prevent compressor damage caused by rapid power interruptions.
  • Complete Installation Kit: Unlike individual boards, the "A" suffix indicates a kit, ensuring you have the updated connectors or wiring needed for legacy system upgrades.
  • Optimized Efficiency: Calibrated to the factory-spec defrost curves to ensure your heat pump spends less time in defrost mode, saving on energy costs during winter.

Shipping & Order Details

  • Continental US Shipping: We offer reliable shipping rates for all orders delivered within the Continental United States.
  • Authenticity: This is a brand-new, genuine Nordyne-Nortek part in original factory packaging.

$199.00

Add to Cart:
  • Model: 917178A
  • Manufactured by: Nordyne
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