Freezer makes loud buzzing or humming noise, especially when compressor starts.

Safety warning: Unplug the freezer before accessing the compressor area. Components may be hot.

Steps to reduce buzzing/humming:

• Access rear compartment: Remove the rear lower panel to expose the compressor and associated components.
• Check compressor mounts: Ensure the compressor mounting bolts or rubber grommets are intact and snug. Tighten loose hardware gently; do not overtighten.
• Inspect tubing: Look for copper lines touching each other or the cabinet. Gently bend them apart slightly to prevent vibration contact, being careful not to kink the tubing.
• Evaluate start relay: If the buzzing occurs only at start-up and the compressor sometimes fails to start, the start relay may be failing. Remove the relay from the compressor and inspect for rattling pieces or burn marks.
• Replace start device: Install a Summit-compatible compressor start relay and overload if the original is suspect. Match it to the compressor model.
• Reassemble and test: Restore power and listen for quieter operation and reliable compressor starts.