Safety: Unplug the wine cooler. The compressor circuit carries mains voltage.

Access compressor compartment: Remove the rear lower service panel to expose the compressor and electrical components.
Inspect start relay: The PTC relay is attached to the compressor terminals. Look for discoloration, cracking, or burnt odor.
Check connections: Ensure the relay is firmly seated on the compressor pins and that the wiring harness is tight.
Test relay: With the relay removed, shake it gently; if it rattles or pieces fall out, it is likely bad. You can also measure resistance across its terminals; an open circuit often indicates failure.
Replace relay: Install a new Summit‑compatible compressor start relay/PTC matched to your compressor model.
Compressor condition: If a new relay does not resolve E8 and the compressor hums then clicks off, the compressor may be locked and require sealed‑system service.
Control board: If the compressor never receives power, the main control board may be defective.

Wine cooler display shows E8 and compressor may not start or may shut off quickly.

Possible Causes