OEM Lennox Fan/Limit Thermostat 90-130°F — 21P88
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The genuine OEM Lennox 21P88 is an adjustable fan and limit thermostat with a 90–130°F operating range and a 20°F differential. This control manages blower operation based on plenum temperature and provides high-limit safety protection, shutting down the heat source if temperatures climb too high. Its lower range makes it well suited to Lennox applications that cycle the fan at more moderate temperatures for improved comfort and efficiency.
A failing fan/limit thermostat can cause the blower to run non-stop, fail to start, or cycle erratically. You may also notice cool air at the registers during startup, short cycling, or safety shutdowns caused by a drifting bimetal element or worn contacts.
Installing the OEM Lennox 21P88 ensures the exact 90–130°F range, 20°F differential, and mounting profile Lennox specifies. As a safety-rated component, using the correct factory control is essential — generic replacements may misread temperature or fail to protect the equipment. The genuine part restores precise, dependable fan and limit control for your Lennox system.
Shipping Information
- Orders placed before 3PM CST ship same business day
- Standard delivery: 2-5 business days
- Express shipping available at checkout
- Free shipping on orders over $75
- Tracking number emailed upon shipment
Return Policy
- 30-day returns on unused parts in original packaging
- Electrical parts (capacitors, contactors, control boards) are final sale once installed
- Email info@nationalhvacparts.com to initiate a return
- Refunds processed within 5-7 business days