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.

How do I read Ice-O-Matic LED indicator light codes?

Ice-O-Matic ICE-series cubers (CIM, ICE0250–ICE2100) and GEM Pearl Ice flakers diagnose faults through front-panel LED indicator lights rather than a numeric display: a Power LED, a Clean LED, a Water LED, and a Bin LED. Each LED has a normal state (solid blue) and a fault state (solid red, slow yellow flash, or fast simultaneous flash) that maps to a specific F/E/HI/LO condition family. The LED pattern plus the on-board service-mode codes printed in the service manual identify the fault — there is no scrolling alphanumeric display on most Ice-O-Matic ice machines.

How are ICE-series cubers different from GEM Pearl Ice flakers?

Ice-O-Matic ships two distinct ice-machine families with different fault patterns. The ICE-series cubers (CIM, ICEU undercounter, ICE0250 through ICE2100 modular heads) make full or half-dice cubes via a vertical evaporator, water-distribution tube, and cube-thickness probe — they expose the LED-pattern + F/E/HI/LO code family covered above. The GEM Pearl Ice flakers (GEM0450 and similar) make small chewable nuggets via a horizontal auger inside a refrigerated cylinder and have their own auger-torque, bin-thermostat, and gearmotor diagnostics rather than the cuber's freeze / harvest backup-timer codes. Always confirm the family on the nameplate before mapping a fault to a code table.

How do I reset an Ice-O-Matic ice machine after a fault?

On most Ice-O-Matic ICE-series cubers, the manufacturer's documented reset is to remove the front service panel (two Phillips screws at the base), then press and hold the Power button and the Clean button simultaneously for three seconds — the LEDs flash blue and yellow to confirm the reset. Press Power once afterwards and both LEDs should return to solid blue for normal operation. A reset on a still-faulted machine just re-trips on the next cycle, so always identify and fix the root cause (dirty condenser, clogged filter, failed thermistor, scaled evaporator) before resetting; otherwise the controller will simply latch the same F/E code again within minutes.

When should I clean an Ice-O-Matic ice machine?

Ice-O-Matic recommends a full descale-and-sanitise cycle at least every six months on most ICE-series and GEM machines, and more often (every three months) in hard-water installations or high-throughput foodservice sites. Indicators that cleaning is overdue include slow ice production, hollow / soft / cloudy cubes, the F5 cleaning-required service code on CIM units, and a slow yellow flash on the Clean LED. Use only Ice-O-Matic-approved nickel-safe cleaner and follow with a sanitiser rinse — household descalers and vinegar can void the warranty and damage the nickel-plated evaporator surface.

When should I call an authorised Ice-O-Matic technician?

DIY tasks for Ice-O-Matic owners and on-site maintenance staff include condenser cleaning, water-filter replacement, the documented Clean cycle and reset for F5, and clearing accumulated bin ice that has triggered the bin-full thermostat. Call an EPA-Section-608-certified refrigeration technician for any HI / LO fault that returns after the basic checks (sealed-system diagnosis, leak repair, brazing, TXV replacement), for repeat F6 / E5 / E6 faults that survive a thermistor swap, for any code involving the control board itself, or whenever the unit is still under Ice-O-Matic factory warranty — unauthorised sealed-system repairs void coverage on the entire refrigeration circuit.

Quick Answer

Ice-O-Matic ICE-series cubers and GEM Pearl Ice flakers diagnose faults through front-panel LED indicator lights plus F-prefix (faults — F5 cleaning, F6 harvest), E-prefix (errors — E5 thermistor, E6 water/condenser probe), and HI / LO (high or low pressure / temperature / water) service codes. Reset by holding Power + Clean for three seconds after fixing the root cause.

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By Nichita Herput

Co-founder & CEO · Reviewed May 2026

What error codes does Ice-O-Matic display?

MINOFWASH LEDSOLIDRED&CLEANLED SLOW FLASH YELLOW 6SEC MACHINE OFF-CLEANIN PROCES

Common questions about Ice-O-Matic equipment

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