Ice-O-Matic F5 Error Code

What does Ice-O-Matic F5 mean?

The CIM series machine has detected that a cleaning cycle is due and has halted normal ice production. The Power LED shows solid red and the Clean LED flashes yellow slowly, indicating the control board has automatically shut the unit off to signal that descaling and sanitizing are required. Ice production will not resume until the cleaning process is completed and the machine is reset.

Symptoms

• Machine stops producing ice and will not restart normally.
• Power LED is solid red on the front panel.
• Clean LED flashes yellow slowly (approximately once every 6 seconds).
• Ice bin empties over time because no new ice is being made.
• Front panel buttons are unresponsive to a simple power cycle.

Common causes

• Scheduled cleaning interval has elapsed — the control board tracks run time and triggers this indicator automatically.
• Mineral scale buildup on the evaporator or water distribution components has degraded ice production, prompting the controller.
• Cleaning cycle was initiated manually via the Clean button and the machine entered the cleaning-off state.
• Previous cleaning was not completed correctly, leaving the board in a cleaning-active state.

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Diagnostic steps

1. Verify the LED pattern

   Confirm that the Power LED is solid red and the Clean LED is flashing yellow slowly — not rapidly. A rapid simultaneous flash of both LEDs indicates a fill or drain fault, which is a different condition requiring separate diagnosis.

2. Perform a full descale and sanitize

   Mix Ice-O-Matic approved ice machine cleaner to the correct concentration, press and hold the Clean button to enter cleaning mode, allow the descale solution to circulate completely through the water system, then drain and flush. Follow with a sanitizer rinse per the CIM cleaning guide.

3. Reset the control board

   Loosen the two Phillips screws at the base of the front panel and lift the panel off. Press and hold both the Power button and the Clean button simultaneously for 3 seconds until the LEDs flash blue and yellow. Release both buttons.

4. Restart the machine and verify normal operation

   Press the Power button once. Both LEDs should turn solid blue indicating normal operation. Monitor the first freeze cycle to confirm ice is forming properly on the evaporator.

5. Inspect and replace water filter if overdue

   A clogged inlet filter reduces flow and accelerates scale buildup. Replace the filter cartridge at each cleaning interval — typically every 6 months — to prevent repeat early-cleaning triggers.

When to call a professional

Call a licensed ice machine technician if the cleaning indicator returns within days of a completed cleaning cycle, if the machine fails to restart after reset, if you notice corrosion or physical damage on the evaporator during cleaning, or if ice production does not return to normal output within one full freeze cycle after reset. Refrigerant system issues or a failing control board can mimic cleaning-interval behavior.