Both refrigerator and freezer are warm; unit not cooling at all, interior lights still work.

Safety first: Unplug the unit before accessing the compressor area. High voltage is present; if you are not experienced with electrical testing, call a professional.

Step 1 – Listen for compressor and fans

• If neither compressor nor fans run, suspect a control or power issue.
• If fans run but compressor is silent and cool, focus on the compressor start components.

Step 2 – Inspect compressor start components

• Remove the rear access panel to expose the compressor and start relay/overload or inverter module.
• Check for burnt smell, discoloration, or rattling parts in the relay.

Step 3 – Basic electrical checks

• With power off, test compressor windings for continuity and similar resistance values.
• If windings are good, replace the start relay/overload or inverter with the correct Sub‑Zero part.

Step 4 – Restore power and monitor

• After replacing start components, restore power and allow several minutes for the compressor to start.
• If the compressor hums briefly then clicks off, or does not start at all, the compressor may be locked and require professional replacement.