If you are seeing erratic shutdowns or short-cycling

this motor provides the precise torque required to overcome external static pressure variations

Is the Allanson 2721-668 compatible with older 2721-668SF models

Rely on this HVAC inducer limit switch to prevent unsafe operation during venting failures or blocked flue conditions

Lennox 97L01 Limit Switch THPU32HP7Y If you are seeing erraticThe Lennox 97L01 Limit Switch is a critical OEM replacement part engineered for precise thermal regulation in Lennox gas furnaces and air handlers. This L200 30F limit switch is designed to open the electrical circuit if the heat exchanger temperature exceeds its 200F setpoint, preventing mechanical failure and ensuring safe combustion cycles. With a 30F differential for automatic reset, it provides consistent high limit protection and prevents