Lennox 43H88 Relay

The Lennox 43H88 Blower Relay is a heavy-duty 3PDT (Three Pole Double Throw) electromagnetic switch engineered for precise load management in commercial and residential HVAC systems. Operating on a 24V coil voltage, this inductive-rated relay is a direct replacement for the legacy Lennox 43H8801, ensuring a 1:1 fit for technicians servicing Lennox packaged units and heat pumps. With a 15 Amp contact rating, the 43H88 provides the switching capacity required to handle multi-speed blower motors and complex control circuits without premature contact pitting or failure.

Built for high-cycle reliability, the Lennox 43H88 relay features robust internal construction to withstand the voltage fluctuations common in field environments. This HVAC blower relay is critical for maintaining proper sequence of operation, allowing the control board to safely isolate low-voltage signals from high-voltage blower loads. Whether you are performing a Lennox 43H88 replacement on a GCS20 series unit or troubleshooting a standard 24V 3PDT relay failure, this OEM-spec component ensures electrical integrity and restores system performance to factory standards.

• Universal Compatibility: Fully interchangeable with the Lennox 43H8801 for seamless field retrofits.
• Enhanced Durability: 15 Amp silver-cadmium oxide contacts provide superior arc resistance and longer service life.
• Precise Switching: 3PDT configuration allows for complex circuit logic, controlling multiple loads simultaneously.
• Reliable Coil Performance: Optimized 24V electromagnetic coil ensures consistent pull-in and drop-out voltages.
• OEM Standards: Manufactured to strict Lennox specifications to ensure compatibility with existing wiring harnesses.

Is the Lennox 43H88 the same as the 43H8801?
Yes, the Lennox 43H88 is a functional and physical match for the Lennox 43H8801, sharing the same 24V 3PDT electrical specifications.

What are the symptoms of a bad blower relay?
Technicians typically look for a blower motor that stays on constantly, fails to start despite receiving a 24V signal, or produces an audible "chattering" sound from the control cabinet.

Can I use a 2PDT relay instead of a 3PDT like the 43H88?
No. The Lennox 43H88 requires three separate poles to manage the specific circuitry of compatible units. A 2PDT relay will not have enough terminals to facilitate the correct wiring sequence.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.