OEM Lennox Heat Pump Defrost Timer Board — 33G95

The genuine OEM Lennox 33G95 defrost timer board controls the timing of defrost cycles on your Lennox heat pump. It counts compressor run time and, together with the coil temperature sensor, initiates and terminates defrost so the outdoor coil stays clear of frost during cold-weather heating. Manufactured to Lennox factory standards, it installs as a direct replacement on the platforms it serves.

Common failure symptoms: A failing 33G95 may allow the outdoor coil to accumulate heavy frost or ice, trigger defrost cycles too often or too rarely, cause cold-air blows indoors, or leave the heat pump stuck in defrost. Reduced heating output and a compressor that short-cycles are common indicators the timer board is no longer sequencing correctly.

Why OEM matters: Defrost timing is matched to each Lennox heat pump's coil and refrigerant design, and a substitute board can throw off cycle intervals, waste energy, or ice the coil solid. The factory-original 33G95 ensures the exact timing intervals, sensor compatibility, and wiring fit your Lennox system was engineered for — keeping defrost efficient and the compressor protected.