Lennox 97W45 Limit Switch 320074-702 What causes a furnace control

What causes a furnace control board to fail prematurely

Common Questions Is the Watts 0067453 compatible with one-pipe steam systems

Enhanced Safety: Finger-proof construction and full fuse isolation in the off position minimize shock risks during electrical disconnect maintenance

As a NEMA 1 rated device

Lennox 97W45 Limit Switch 320074-702 What causes a furnace controlThe Lennox 97W45 Limit Switch is a critical safety component designed for precise thermal regulation within residential gas furnaces and air handlers. Engineered as a normally closed thermal switch, this L140 30F secondary limit monitors heat exchanger temperatures to prevent overheating and potential heat exchanger fatigue. With a fixed temperature setting of 140F and a 30F differential, this Lennox high limit sensor ensures a reliable cutout when