Lennox 53K80 Fan Timer Kit 30067439-890 Engineered with a rough bronze

Engineered with a rough bronze body and 1/2" NPT male connections

the Pop-Top zone valve interface ensures a secure mechanical connection

What causes this switch to trip

or 5/32" I

Extended Service Life: Replaces fatigued springs and worn plunger assemblies to prevent coil burnout and mechanical failure

Lennox 53K80 Fan Timer Kit 30067439-890 Engineered with a rough bronzeThe Lennox 53K80 Fan Timer Kit (replaces LB 90157A) is a critical OEM replacement component engineered for precise fan motor orchestration in Lennox Pulse G21 and high efficiency furnace series. This HVAC control board integrates a sophisticated fan timer control circuit that manages the post purge and pre purge cycles of the blower motor to optimize heat exchanger thermal discharge. Designed for high duty cycle applications, the kit includes the