A Lennox 32W87 Switch interrupts the circuit when pressure falls too low to protect the system and restore normal cycling once conditions recover.
The switch monitors refrigerant pressure in the HVAC system and opens or closes the control circuit when pressure drops outside the intended range. Its calibrated low-pressure design matters because it protects key components from operating under unsafe conditions and supports stable performance in heating and cooling equipment.
The switch might need replacement if the heating and cooling unit cycles improperly, shuts down unexpectedly or fails to respond correctly when refrigerant pressure changes. Physical signs can include damaged terminals or a cracked housing and environmental signs may include corrosion, moisture exposure or dirt buildup that can interfere with reliable switching.
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