Customer Questions and Answers for Compressor Start Relay (Ptc) by Whirlpool

This PTC start relay mounts on the compressor and briefly powers its start winding to get it running, then drops out. Replacing a weak relay can restore reliable starts and resolve clicking/humming with no cooling.

• Provides the initial boost to the compressor via a positive temperature coefficient (PTC) element, then opens as it heats
• Takes the start winding out of the circuit once the compressor is running
• Typical failure symptoms: compressor won't start, repeated clicking/humming, no cooling, visible heat damage at the relay or connector
• Direct replacement for the original PTC start device used on applicable models

• Disconnect power before servicing; allow hot components to cool
• Access the compressor compartment, remove the cover, and note the relay's orientation; pull the old relay straight off the compressor pins
• Inspect wiring terminals for heat damage; do not reuse burnt connectors
• Firmly seat the new relay on the compressor terminals, reinstall the cover, restore power, and verify compressor start