OEM Lennox Defrost Control Board — 23M22
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The genuine OEM Lennox 23M22 defrost control board manages the defrost cycle on your Lennox heat pump. During cold weather, frost and ice accumulate on the outdoor coil and reduce efficiency. This board monitors time and coil temperature, then reverses the refrigerant flow to melt the ice and restore proper heating performance — a function essential to keeping your heat pump running efficiently through winter.
Common failure symptoms: When the 23M22 fails, you may notice a heavily iced-up outdoor unit, a heat pump that won't defrost or defrosts too frequently, weak or no heating, or the auxiliary/emergency heat running constantly. Erratic reversing-valve operation and no response to the defrost sensor are also telltale signs of a failed board.
Why OEM matters: Defrost logic is specific to each Lennox model's timing intervals, sensor thresholds, and relay outputs. A generic board can misread coil conditions, waste energy, or leave your unit iced over. The factory 23M22 guarantees the correct defrost programming, connector layout, and terminal assignments for a true plug-and-play repair on your Lennox equipment.
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