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the Lennox 43H89 and 43H8901 are the same physical component and are used interchangeably in manufacturer parts manuals
It is a direct drop-in replacement for part number 34335004 (also referenced as HQ34335004TD) and is frequently used in residential heating models including Tempstar
the trap may fail in the closed position
Key Benefits System Compatibility: Serves as a direct OEM replacement for Lennox 26K3501 and LB-85663K
Markel 44565001 Relay 320734-701 the Lennox 43H89 and 43H8901The Markel 44565001 Relay is a specialized 24V control relay engineered for heavy duty HVACR applications where precise circuit switching is critical. This SPDT control relay features a 24V coil voltage and is designed for seamless integration with primary voltages of 120V, 240V, and 277V. For technicians performing field service repairs on industrial electric heaters or air handling units, its compact footprint allows for straightforward installation
