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What causes a furnace control board to fail prematurely
allowing technicians to restore system performance and reliable ignition sequences in mobile home heating applications
This genuine OEM replacement part ensures complete signal integrity between your control board and critical peripherals like the pressure switch or inducer motor
refer to your valve body’s nameplate specifications for fluid temperature limits
this specific model requires a 208V to 240V signal to energize the coil
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
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