The Lennox 21W89 is a genuine OEM Transformer/Relay designed as a direct replacement component for compatible Lennox heating and cooling systems. Combining transformer and relay functions in a single integrated assembly, this component helps maintain accurate voltage regulation and switching control within the HVAC system’s electrical circuit.
Key Features
- Genuine Lennox OEM replacement part (SKU: 21W89)
- Integrated transformer and relay assembly for streamlined installation
- Engineered to meet original Lennox equipment specifications
- Supports reliable voltage step-down and switching control
- Direct drop-in replacement for compatible Lennox systems
Application
The 21W89 Transformer/Relay is intended for use in compatible Lennox HVAC equipment where the original transformer/relay assembly requires replacement. Always verify compatibility with your specific Lennox unit model before installation. Consult the equipment service manual or a qualified HVAC technician for proper installation procedures.
Why Choose Genuine Lennox OEM Parts?
- Ensures proper fit and function within your Lennox system
- Maintains manufacturer performance standards
- Reduces risk of premature failure associated with aftermarket substitutes
- Supports equipment warranty compliance








