E7 appears and the unit may fill with water but never freeze properly; compressor may not run.

Safety first: Unplug the unit before removing panels. High voltage is present at the compressor terminals.

• Inspect compressor wiring: Remove the rear panel and check the wiring harness from the control board to the compressor. Look for burned or loose connectors.
• Check board relay: On the main control board, locate the compressor relay (often a small rectangular component). Inspect for burn marks or cracked solder joints on the underside of the PCB.
• Test compressor windings: With the start components removed, measure resistance between the compressor terminals (C‑R, C‑S, R‑S). Compare to specifications. A dead short or open winding indicates a failed compressor.
• Repair or replace: If the compressor tests good but the relay is visibly damaged or not energizing (no click, no output voltage), replace the main control board. If the compressor windings are faulty, a sealed system technician must replace the compressor.