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The genuine OEM Lennox 28W50 potential relay works hand-in-hand with the start capacitor to get your Lennox compressor running. It energizes the start capacitor at startup for the extra torque needed to spin the motor, then automatically drops the capacitor out of the circuit once the compressor reaches operating speed — protecting the start capacitor from overheating.
Common failure symptoms: A defective 28W50 potential relay commonly causes a compressor that won't start or hums without turning over, repeated start-capacitor burnout, tripped breakers, or short cycling on the compressor. Because the relay and start capacitor fail together so often, they're frequently replaced as a pair.
Why OEM matters: Potential relays are rated to a specific pickup and dropout voltage tuned to your compressor's back-EMF. A mismatched relay can leave the start capacitor energized too long — destroying it — or drop out too early, causing hard starts. The OEM Lennox 28W50 is matched to your compressor's exact electrical characteristics, ensuring correct switching, protected components, and dependable starts.