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The Lennox 22J86 Asurity CS-1 Condensate Safety Overflow Switch is an OEM replacement part that protects your Lennox system and surrounding property from water damage caused by a clogged or overflowing condensate drain line. When the condensate pan reaches a critical level, this switch automatically shuts the system down to prevent overflow and potential structural or equipment damage. If your Lennox unit is unexpectedly shutting off or showing signs of condensate backup, replacing this switch with the factory-spec 22J86 ensures reliable protection and accurate system response.