OEM Lennox Honeywell Defrost Control Board — 17M14
OEM Guaranteed
Same-Day Ship
30-Day Returns
Secure Checkout
The genuine OEM Lennox 17M14 is a Honeywell-built defrost control board for Lennox heat pump systems. It reads the defrost thermostat and runs a demand or time/temperature defrost algorithm, then commands the reversing valve, outdoor fan relay, and auxiliary heat as needed to clear frost from the outdoor coil and maintain efficient heating in cold weather.
Common failure symptoms: A failing 17M14 commonly causes an ice-covered outdoor unit that never defrosts, defrost cycles that run endlessly, the outdoor fan energizing at the wrong time, constant auxiliary heat, or a total loss of heat-pump heating. Burnt or pitted relays, a blank or blinking fault LED, and heat-damaged traces indicate the board has failed.
Why OEM matters: This Honeywell board is programmed with the exact defrost timing, sensor logic, and relay ratings Lennox specifies for their equipment. Aftermarket boards with different jumper options or firmware can mis-sequence defrost, chatter the reversing valve, or fail to protect the compressor. The factory 17M14 ensures correct timing, proper terminals, and reliable 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