Product Overview
The Lennox 15D57 / 100135-04 Defrost Control Board is a genuine OEM HVAC control solution designed for Lennox heat pump systems. This demand defrost control board helps regulate defrost cycles, protects the compressor from excessive frost buildup, and improves heating efficiency during cold weather operation. Professionally refurbished and tested, this board is ideal for restoring proper operation to compatible Lennox, Armstrong, Ducane, Concord, and Allied heat pump systems.
The Lennox 15D57 Defrost Control Board replaces several older Lennox demand defrost control assemblies, including part number 100135-04. This OEM control board is responsible for monitoring outdoor coil temperature, initiating defrost cycles when necessary, and protecting the compressor against high-pressure and short-cycle conditions.
The kit typically includes the defrost control board and ambient sensor harness for proper installation and operation. This board is commonly used in Lennox XP and HPX series heat pump systems and is engineered for reliable performance in residential HVAC applications.
Each board is professionally inspected, tested, and packaged carefully to help ensure dependable operation.
- Genuine OEM Lennox defrost control board
- Replaces 100135-04 and multiple legacy part numbers
- Controls heat pump defrost operation
- Helps prevent excessive frost accumulation
- Supports compressor protection and anti-short cycling
- Includes compatibility with many Lennox XP and HPX systems
- Professionally refurbished and tested
Common Symptoms Fixed
- Heat pump not entering defrost mode
- Outdoor coil freezing excessively
- Intermittent heating issues
- Heat pump short cycling
- Defrost cycle failures
- Diagnostic LED fault codes
- Outdoor fan or reversing valve issues during defrost
XP15-024-230-01, XP15-024-230-02, XP15-030-230-01, XP15-030-230-02, XP15-036-230-01, XP15-036-230-02, XP15-042-230-01, XP15-042-230-02, XP15-048-230-01, XP15-048-230-02, XP15-060-230-01, XP15-060-230-02, XP16-024-230-01, XP16-036-230-01, XP16-048-230-01, XP16-060-230-01, XP19-024-230-01, XP19-036-230-01, XP19-048-230-01, XP19-060-230-01, HPXA12-024-230-01, HPXA12-030-230-01, HPXA12-036-230-01, HPXA12-042-230-01, HPXA12-048-230-01, HPXA12-060-230-01, HPXA19-024-230-01, HPXA19-036-230-01, HPXA19-048-230-01, HPXA19-060-230-01
Part Number Cross-Reference
15D57, 100135-04, 100135-03, 100135-06, 13U60, 15D5701, 56M85, 56M8501, 86M38, 41W72, 41W7201, 40W00, 81W99, 60L39, 46M82, 10M89
