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The Lennox 39H98 is a genuine OEM double-pole, double-throw relay rated at 24 volts, engineered to manage dual-circuit switching operations in compatible Lennox heating and cooling equipment. Signs of a failing relay include erratic system behavior, components not energizing correctly, or complete loss of function in controlled circuits. This direct OEM replacement guarantees compatibility and long-term reliability for Lennox systems requiring a 24V DPDT relay.