OEM Lennox Defrost Control Board 102151-01 — 47W47
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The genuine OEM Lennox 47W47 (factory number 102151-01) is a defrost control board for Lennox heat pump systems. It monitors the defrost thermostat and its timing circuit to determine when the outdoor coil needs a defrost cycle, then energizes the reversing valve and outdoor fan relay to clear frost and restore efficient heating.
Common failure symptoms: A failing 47W47 often shows up as an outdoor unit that ices over and never defrosts, defrost cycles that never end, the fan running during defrost when it shouldn't, no heat-pump heating, or the auxiliary heat running constantly. Burnt relay contacts, tripped or blank status LEDs, and a scorched board are common visual signs.
Why OEM matters: Lennox defrost boards use specific timing intervals and terminal logic tuned to their equipment. An aftermarket board with different jumper settings or relay ratings can mis-time defrost, cause reversing-valve chatter, or fail to protect the compressor. The factory 47W47 ensures exact timing, correct terminals, and dependable defrost control for your Lennox system.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days