Display shows E9 and the compressor may not start or may short-cycle frequently.

Safety first: Unplug the refrigerator. The compressor circuit carries mains voltage and can be hazardous.

Basic checks:

• Access the compressor compartment at the rear bottom.
• Inspect the start relay/overload device or inverter module attached to the compressor for burn marks or rattling (a rattling PTC relay is often failed).
• Ensure all spade connectors are tight on the compressor terminals.

For traditional start relay systems:

• Test the start relay and overload for continuity; replace if open or visibly damaged.

For inverter compressors:

• Check the DC supply from the main board to the inverter (requires model-specific service data and should be done by a professional).

If E9 persists after replacing a faulty relay or inverter module, the main control board or compressor itself may be defective. Compressor replacement should be performed only by an F-gas certified technician.