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The Lennox 10P97 is a genuine OEM universal fan and limit control featuring an 11-inch insertion element. It controls when the furnace blower cycles on and off according to plenum temperature and provides a high-limit safety cutout that de-energizes the burners if the heat exchanger overheats. The long 11-inch probe suits larger plenums and deeper furnace applications across many Lennox models.
Common failure symptoms: When the 10P97 wears out, you may see the blower running nonstop or failing to start, cold air at the registers, erratic short-cycling, or the furnace tripping on limit and locking out. A drifting bimetal element or burned contacts are the usual culprits.
Why OEM matters: Even as a universal-style control, the correct element length and calibrated setpoints are critical to safe furnace operation. The factory-spec 10P97 ensures the 11-inch probe seats properly in the plenum and trips at the rated temperature for reliable blower timing and safety protection. Off-brand controls with the wrong element length or setpoints can nuisance-trip or leave the heat exchanger unprotected. Insist on genuine OEM for dependable, safe performance.