Ice maker displays EC90 or service code 90 and will not run. Control appears unresponsive or stuck in error.

Safety: Disconnect power at the breaker before accessing the control compartment.

Steps to address EC90:

• 1. Power cycle: Turn off power for at least 10 minutes to allow the control to fully discharge. Restore power and check if the error clears.
• 2. Inspect control connections: Remove the front grille or control cover to access the main control board. Verify all harness connectors are fully seated. Gently unplug and replug each connector to clean contacts.
• 3. Check for visible damage: Look for burn marks, swollen components, or corrosion on the control board. Any visible damage usually means the board must be replaced.
• 4. Verify supply voltage: Use a multimeter (if qualified) to confirm correct line voltage at the ice maker's terminal block. Incorrect voltage can cause control faults and must be corrected by an electrician.
• 5. Replace control board: If EC90 persists and wiring and voltage are correct, the control board is likely defective. Replace it with an OEM Sub-Zero board, transferring any jumpers or programming plugs as specified in the service instructions.

Warning: Control board replacement involves exposure to live circuits if power is not fully disconnected. If you are not experienced with electrical work, contact a professional.