FixGrid Academy — Field checklist
Ice Machine Not Producing
Commercial cuber ice machine (Manitowoc / Hoshizaki / Scotsman style) · Intermediate
Machine runs, water present, no ice. Water side and scale before anything sealed-system.
1Safety first
- Open the disconnect or breaker and lock it out.
- Confirm dead with a non-contact tester.
- Watch sharp evaporator edges and standing water.
- Gloves, eye protection, towels, and hand tools staged.
2First checks
- Confirm the machine is actually attempting a freeze cycle.
- Verify water is filling the trough and the float/inlet is working.
- Read the machine's own indicators and clean/long-cycle notices.
- Check bin thermostat / bin full switch is not holding the machine off.
3Narrow the system
- Split it: water-side and scale vs harvest vs refrigeration side.
- Time the cycle — long freeze with thin or no build points at water or airflow.
- Observe the evaporator: uniform build, patchy build, or nothing?
- Check condenser cleanliness and discharge air temperature.
4Highest-probability tests
- Pull and inspect the water distribution tube for scale-blocked holes.
- Check the water trough, float valve, and inlet screen for restriction.
- Inspect the evaporator face for heavy scale.
- Verify the water curtain seats and the curtain switch actuates.
5Common outcomes and watch-outs
- Most common: heavy scale blocking water distribution, or a starved water supply.
- Water quality drives repeat failures — set a cleaning interval in writing.
- A dirty condenser will mimic a sealed-system problem; clean it first.
- Only pursue sealed-system diagnosis after water, air, and harvest check out.