Short answer: of the 8 commercial ice machines we found not making ice from July to early November 2026 with a recorded cause, the water side alone explained 2, an inlet valve and a Hoshizaki water pan. One more needed a pump and inlet valve plus a control board. The other 5 were refrigeration, fan, sensor and electrical faults. Check the water supply and filter first, but don’t assume it’s water.
The rest of this page is what those calls looked like, how to tell the causes apart, and what the manufacturer says an owner can check.
What we found on our 2026 ice machine calls
From July 1 to November 9, 2026 our CRM has 21 jobs on commercial ice machines (Manitowoc, Hoshizaki, Scotsman, Avantco, Donper, jobs written up as a commercial ice machine, and one ice machine job at the same address as a Manitowoc we service). Ten came in making no ice or too little. Eight of those have a recorded cause. On the other two, one has no finding written down and one was cleaned and watched through its cycles without a single cause named.
| What we found | Calls | What the owner noticed | What it took |
|---|---|---|---|
| Water inlet valve letting the water run out mid-cycle | 1 | Not making ice at all. Our tech found thin cubes | Filter cleaned, inlet valve replacement quoted |
| Hoshizaki water pan mechanism (cam and spring) | 1 | Not making any ice | Cam mechanism cleaned and spring replaced. A later error code pointed at the actuator or board for more testing |
| Four parts replaced: water pump, inlet valve, control board, toggle switch | 1 | Not producing ice | All four replaced, then the machine was tested |
| Refrigerant leak | 1 | Not making ice | Leak found, owner took time to decide |
| Compressor would not start | 1 | Starts a cycle, then shuts off | Compressor replacement with sealed-system work recommended |
| Condenser fan motor failing | 1 | Not freezing ice, with a grinding noise | Condenser fan replaced on a second visit |
| Two temperature sensors failed | 1 | Not working, with a string of error codes | Sensors confirmed failed. The water pump was also rattling |
| Electrical fault in the control circuit | 1 | Stopped working completely | Fault found and fixed, coil cleaned |
Where those 8 were:
| City | Machines | What we found |
|---|---|---|
| Oakland | 3 | Refrigerant leak, water pan mechanism, condenser fan |
| Palo Alto | 1 | Pump, inlet valve, board and switch |
| San Ramon | 1 | Inlet valve |
| Livermore | 1 | Compressor |
| Alamo | 1 | Temperature sensors |
| Lafayette | 1 | Electrical fault |
It’s a small local sample. It still makes one point clearly. Water problems are worth checking first because they’re cheap to rule out. But on 5 of the 8 machines with a recorded cause, the cause was outside the water side.
About half of the other 11 jobs were cleaning and maintenance. On one Hoshizaki in Emeryville that meant removing mineral scale from the water system and the evaporator with ice machine descaler. A leaking Hoshizaki in Fremont had heavy buildup in its drain system. We flushed the drain and cleaned the condenser.
How to tell the causes apart
Thin or hollow cubes, or a short batch. That points at the water supply first. On our Avantco call the machine ran out of water in the middle of the freeze cycle, so the cubes never filled out. Low supply pressure, a plugged filter or a valve that only trickles all look like this.
Water in the sump but a dry evaporator during freeze. In Manitowoc’s freeze sequence the water pump runs water over the evaporator. If the sump has water and the evaporator stays dry, the pump or the distribution tube is next.
A clunk, a drop, and the machine trying again. On the Hoshizaki IM-200BAC the water pan assembly is opened and closed by an actuator motor, cams and springs, according to its service manual. On our Oakland call the pan kept dropping and starting over. A cleaned cam and a new spring fixed that part.
Starts a cycle, then shuts off. Don’t stop at the water side. On our Livermore Manitowoc the water was circulating normally. The compressor hummed, drew about 45 amps without starting, and the overload kept tripping it.
Noise and no ice. On one Oakland Manitowoc the owner reported no ice, and our tech traced a grinding noise to the condenser fan motor.
What Manitowoc says to check first
Manitowoc’s S Model Technician’s Handbook (part number 8014793) has a Water System Checklist. Its first line is the reason this page exists: a water-related problem often causes the same symptoms as a refrigeration fault, and water problems must be found and eliminated before refrigeration parts are replaced. These are the items an owner can look at without opening anything:
- Watch the fill. With the machine off, the inlet valve must stop all water flow. With it on, water should flow in properly. If it’s slow or only trickles, it’s a water-side problem.
- Check the supply. The handbook lists inlet water pressure between 20 and 80 psig and incoming water between 35°F and 90°F. Make sure the shut-off valve to the machine is fully open.
- Check the filter. A plugged water filter is on the list. If yours is past its change date, replace it.
- Look at the evaporator. A dirty water area or uneven water flow across the evaporator calls for a cleaning.
- Keep the cleaning schedule. The handbook calls for cleaning and sanitizing at least once every six months. It has a separate heavy-scale procedure if the machine stops on safety shutdown, the water is high in minerals, or it hasn’t been on a regular maintenance schedule. It also says only Manitowoc’s own cleaner and sanitizer are approved for its machines.
Stop there. Removing the inlet valve, the pump or the probes means cutting power and water first, and the refrigeration and board checks need meters and gauges.
What we check on a no-ice call
We start with the model and what the owner saw. Then we watch a full cycle: does it fill, does water run over the evaporator, does the ice form evenly, does it harvest. Only after the water side checks out do we go to the refrigeration side and the electrical readings.
On the Livermore call the water circulation was working normally. The compressor drew about 45 amps without starting, the supply measured about 104 volts under that startup load, the run capacitor read 52 µF on a 50 µF rating, and the start relay measured within spec. That pointed to a locked compressor.
You get the cause, the repair it needs and the written price before any work starts.
What it costs
- Diagnostic visit: $99, credited toward the repair if you go ahead with us.
- Repair prices depend on the part and the machine, so we quote each one in writing after the diagnosis.
ADRIUM is an authorized Manitowoc service company, and we also work on Hoshizaki and other commercial ice machines. See our Manitowoc page, our Hoshizaki page, or the commercial ice machine repair page to book. Our ice machine calls this fall were in Oakland, San Ramon and around the East Bay, Tri-Valley and Peninsula.
When to call
Descaling and the checklist above are things you can do today. Everything past that is a tech job.
If the reservoir fills and the pump is running but you’re still not making ice, you’re looking at control board faults, temperature sensor failures, or refrigerant issues. Those require proper test equipment, and refrigerant work requires EPA Section 608 certification. Guessing at that point costs more than the service call.
If the display shows a code on a Manitowoc, the Manitowoc E5 error code guide covers the harvest fault.
The diagnostic visit is $99, credited toward the repair. Call us or request a visit.