Display shows EC; refrigerator may not cool correctly; may be associated with compressor or inverter issues.

Safety first: Unplug the refrigerator before accessing the compressor or inverter. High-voltage and stored energy are present; only qualified persons should test live circuits.

Step 1 – Listen for compressor operation:

• With the unit powered, listen at the back for a humming or vibration from the compressor.
• If the compressor is silent while fans run, an inverter or compressor issue is likely.

Step 2 – Inspect inverter board and wiring:

• Remove the rear lower panel to access the compressor and inverter (if equipped).
• Check the low-voltage harness from the main control board to the inverter for secure connections.
• Look for burn marks or damage on the inverter board.

Step 3 – Basic checks (non-invasive):

• Ensure the refrigerator is on a dedicated circuit with proper voltage.
• Power cycle the unit for 5 minutes and see if EC clears temporarily.

Step 4 – Advanced testing (technician-level):

• Testing compressor windings and inverter output requires a multimeter and knowledge of high-voltage safety.
• If the compressor windings are open or shorted, the compressor must be replaced.
• If the inverter is not providing correct output but the compressor tests good, replace the inverter board.

When to call a technician: EC typically indicates a problem that requires specialized tools and certification. Contact a GE Monogram technician for sealed system and inverter diagnostics.