OEM Lennox Time Delay Relay — 16D74

The genuine OEM Lennox 16D74 time delay relay manages timed switching within your Lennox furnace or air handler control sequence, introducing a precise delay before energizing or de-energizing components such as the compressor, blower, or auxiliary circuits. This built-in delay protects the compressor from rapid short-cycling, allows refrigerant pressures to equalize between cycles, and ensures the blower ramps in the correct order for smooth, efficient operation.

When a time delay relay fails, you may notice the compressor short-cycling on and off, the blower starting or stopping at the wrong time, tripped breakers, or the system failing to start altogether. Contacts that are pitted, burnt, or stuck — or timing that has drifted out of spec — are common signs the relay has reached the end of its service life.

Choosing an OEM Lennox 16D74 guarantees the exact timing tolerance, contact rating, and terminal configuration your equipment was engineered for. Generic substitutes often use different delay intervals or lower-rated contacts that can compromise compressor protection and void your Lennox warranty. Install a factory-matched replacement to restore reliable, correctly sequenced operation.